SQL Interview Questions

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SQL Interview Questions

[{"selector":"#anim-d949994d-1bfc-4b68-8586-fcac19b39220 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-d691da25-5ee3-42b1-a6ab-6d66971e55f9","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f6285db6-e41d-46ca-bc3a-129c0730a912","keyframes":{"transform":["translate3d(0px, 794.37882%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-32143597-29f4-4db7-baf7-c34c8be7ebc1","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0bb47018-24e3-4a3e-9006-fcadfef29e5c","keyframes":{"transform":["translate3d(0px, 191.71312%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] Whether you're an experienced SQL developer or just starting out, successfully passing a SQL interview requires in-depth knowledge and confidence in answering a variety of questions.

SQL Interview Questions

[{"selector":"#anim-bd461a7b-513f-4398-8948-334850b2d104 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-ecdc8748-4ead-40c1-8d1f-8e3a4c4b7d6b","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-934f3025-d7d7-4412-92ef-3b3339fe7339","keyframes":{"transform":["translate3d(0px, 794.37882%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b3da8e8a-baa6-4499-ba8f-df04a0d0bfa7","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-89f2caba-2c4a-4bef-a641-62e220440020","keyframes":{"transform":["translate3d(0px, 133.93044%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] We've compiled for you SQL questions you might encounter on job interviews. Get ready to explore key concepts, refined queries, and helpful tips to prepare for any challenge in the SQL interview world and succeed in your database career.

1. What is Database?

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2. What is DBMS?

[{"selector":"#anim-8c13bc70-332e-4ee0-8ad6-e09140cbecb6 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-da7c28e2-1ca5-4237-9432-f16e4213c49b","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-fc79d66c-2f3e-4265-abe4-3d91b5984e80","keyframes":{"transform":["translate3d(0px, 322.07979%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

3. What is RDBMS? How is it different from DBMS?

[{"selector":"#anim-7d6a0423-1a9d-4b04-91db-427f3cfa762f [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-5474f676-d106-4765-927a-e2c0cb7668ec","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-2c292f54-88e2-4012-83e5-a987d0f1d141","keyframes":{"transform":["translate3d(0px, 170.89948%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

3. What is RDBMS? How is it different from DBMS?

[{"selector":"#anim-3b7e53cc-0e81-4ffd-af12-7ae69772c680 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-32c54855-9e11-4d0b-b341-b51f118aebfc","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0445db46-f4ec-4e42-8bb8-3dec0a6ed4c5","keyframes":{"transform":["translate3d(0px, 170.89948%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

4. What is SQL?

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5. What is the difference between SQL and MySQL?

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6. What are Tables and Fields?

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7. What are Constraints in SQL?

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8. What is a Primary Key?

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9. What is a UNIQUE constraint?

[{"selector":"#anim-7c635486-f387-4d64-a208-3fd9977bf70e [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-e8f35944-b402-4a41-8565-ade95db18aa2","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-58df2700-2c28-49ca-a781-fbcf381de629","keyframes":{"transform":["translate3d(0px, 224.30555%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

10. What is a Foreign Key?

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11. What is a Join? List its different types.

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More

[{"selector":"#anim-c412c70b-d8c0-4e8c-9c40-d88aecfdc9f0","keyframes":{"opacity":[0,1]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-be524545-7e41-490d-b91b-f090be4c2269","keyframes":{"transform":["translate3d(-126.33136%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-3e86e23b-485d-4065-9c0e-777e301b215c","keyframes":{"opacity":[0,1]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-4f21d0b8-5506-41bf-856f-a85c235e77dc","keyframes":{"transform":["translate3d(-120.51283%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-dfc93d65-388a-47d6-ba87-1b0b89bb3806","keyframes":{"opacity":[0,1]},"delay":200,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0bfc48f6-cd53-421a-bfa7-90f3224aa94e","keyframes":{"opacity":[0,1]},"delay":300,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-91ae6455-4f2e-4c9a-bc98-d9ba415debf1","keyframes":{"opacity":[0,1]},"delay":400,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c1edd3df-108f-46e0-9dec-13c8bb744fb1","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-80a5d4d2-2515-4b57-936f-ab89913db65d","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-51bda56e-bf63-48d4-af38-b37ac401224c","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Learn more

12. What is a Self-Join?

[{"selector":"#anim-a3bdbcb3-ad71-47d7-8d13-51a989be9869 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-401181f6-3dfc-4835-91fb-f73fc1b0cfc9","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-26c0a4d8-9d10-403e-8570-f0d9105d0f7f","keyframes":{"transform":["translate3d(0px, 326.26259%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

13. What is a Cross-Join?

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13. What is a Cross-Join?

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14. What is an Index? Explain its different types.

[{"selector":"#anim-25ed788f-e338-4ac1-a173-a878c17dae3b [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-a69f612a-90e2-4d78-9c17-57e024c8aa34","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-eef4fe6e-0806-4c33-8d0c-4dac70a593bf","keyframes":{"transform":["translate3d(0px, 170.89948%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

15. What is the difference between Clustered and Non-clustered index?

[{"selector":"#anim-c9949ef7-faeb-4697-8dbc-a3b19f677232 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-99ffc34d-f8be-479c-adde-145ce231cd27","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-24c62ff5-3641-4341-8469-ed0d09a734d0","keyframes":{"transform":["translate3d(0px, 138.03420%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

16. What is Data Integrity?

[{"selector":"#anim-80fac7c0-e257-402f-ac5c-fa640761b04f [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-1de80761-7d71-46f0-9a27-d8be7bc2ee1e","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8e1f1ec8-4e7f-4731-8352-3ad06af32a65","keyframes":{"transform":["translate3d(0px, 224.30555%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

17. What is a Query?

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18. What is a Subquery? What are its types?

[{"selector":"#anim-07176baf-6c31-4ced-9bc8-cb808b3186f5 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-efbf67d3-7053-4247-aca3-5c64359c3e3f","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ba83bcd4-8738-4a71-b909-8ddbac0fc4b5","keyframes":{"transform":["translate3d(0px, 224.30555%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

19. What is the SELECT statement?

[{"selector":"#anim-c200b411-d861-41bb-a2d1-d6676ce585aa [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-9464a03b-6e81-4a58-9b86-8ff71d15f8e7","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-2c568049-d067-439a-9bb5-e7f9f804abf7","keyframes":{"transform":["translate3d(0px, 224.30555%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

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[{"selector":"#anim-c41ba66a-7781-44a0-9b50-03f5a5492a1d","keyframes":{"opacity":[0,1]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d5378e60-1500-427c-aa6b-dfbbb7e4db39","keyframes":{"transform":["translate3d(-126.33136%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8d596c8e-92fd-43e4-84e4-b8b3b8ae3c11","keyframes":{"opacity":[0,1]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ee967bd8-e336-4c8d-91bd-b175ee1667f4","keyframes":{"transform":["translate3d(-120.51283%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-4a97f4c3-5626-48ab-a775-1e3b8d59cc33","keyframes":{"opacity":[0,1]},"delay":200,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-9b3041e5-009b-4329-bcc5-5736d7f46e07","keyframes":{"opacity":[0,1]},"delay":300,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d7f88b36-be16-4726-884d-70657c57e0af","keyframes":{"opacity":[0,1]},"delay":400,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-9dbfc642-cbd8-4dd9-872d-3add9c06d63e","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-33629b23-f0be-43f4-9729-d3821af990e5","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b823b8e3-b21f-429f-af27-f2ee56c9f8ce","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Learn more

20. What are some common clauses used with SELECT query in SQL?19. What is the SELECT statement?

[{"selector":"#anim-57cb970d-33a6-4ea7-8271-ef2f95a679d1 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-9918d80c-3b7d-4c48-a82b-28155047c65c","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6154cec0-7b4c-4a89-aa03-41ea4800c5d7","keyframes":{"transform":["translate3d(0px, 123.50087%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

21. What are UNION, MINUS and INTERSECT commands?

[{"selector":"#anim-835b91db-b45d-4bd1-99f6-be446176d43a [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-a427afd7-1a27-48a3-8892-f019fba07fe7","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-474fc1ab-bac3-4ab1-96df-a2a9c0753279","keyframes":{"transform":["translate3d(0px, 171.00120%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

22. What is Cursor? How to use a Cursor?

[{"selector":"#anim-d23bf8ec-53b1-4f33-8bf2-43162d93f379 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-489b430f-8b7d-42ae-834a-468a0caf5550","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b3eae218-8a06-46ed-bf2b-a88998fe4962","keyframes":{"transform":["translate3d(0px, 211.71577%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

23. What are Entities and Relationships?

[{"selector":"#anim-f789c9c3-31e9-419c-8f3d-c534570d3161 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-657356f8-a810-4419-bea1-6fe740e86b2a","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-596b7379-5046-4b28-80bf-94325aa5cde8","keyframes":{"transform":["translate3d(0px, 277.87693%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

24. List the different types of relationships in SQL.

[{"selector":"#anim-831d4b52-35c8-4179-ad77-9c93307fce6d [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-038f1bbb-b99c-4eb1-a1aa-8756ebe4a859","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b56b3e1d-a1d9-4d6a-aca1-8b3e7db033e8","keyframes":{"transform":["translate3d(0px, 211.71577%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

25. What is an Alias in SQL?

[{"selector":"#anim-e035380f-db73-4537-8ec1-5d9022abfcda [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-c8daf6cb-b09a-4c70-ada2-858f33108b83","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-3fb45dd4-7c7f-42c4-84d3-676645baa66d","keyframes":{"transform":["translate3d(0px, 277.87693%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

26. What is a View?

[{"selector":"#anim-f514fd06-ed91-41ba-9ad2-f530e012c78f [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f1d2935e-006e-407e-8be9-aa14fe428ba0","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-37b2ca57-64bb-432a-aa18-b09eb1f3568d","keyframes":{"transform":["translate3d(0px, 402.88590%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

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[{"selector":"#anim-5c6bdbac-5d2a-4893-aa70-d151a45cc24c","keyframes":{"opacity":[0,1]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-8803798a-e21c-4aa0-a6a0-307c6cd4d28f","keyframes":{"transform":["translate3d(-126.33136%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-3f38abc5-e5b8-4850-80b6-67ad5f401af8","keyframes":{"opacity":[0,1]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-5ce6b938-86a9-4221-9451-be3a2d356040","keyframes":{"transform":["translate3d(-120.51283%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6d1175a6-c8fe-4df3-ad82-64076c4c9e5a","keyframes":{"opacity":[0,1]},"delay":200,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-c3cdb68e-3f2c-43fc-b736-f2a1f9460ec3","keyframes":{"opacity":[0,1]},"delay":300,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-05a1e542-32f5-4268-8846-3bb2e948d083","keyframes":{"opacity":[0,1]},"delay":400,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-f40c55bd-252d-4c99-bd1c-e7851a247504","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a371aba5-2d57-4709-91f3-0f469065cc0b","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6ae092c1-c986-4b8e-bdd0-723789f6f074","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Learn more

27. What is Normalization?

[{"selector":"#anim-6b91eb88-7054-41df-95bc-afe5567d7de2 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-582aff13-2d39-4cb6-b847-02239313968c","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-18deb167-4474-47bf-83c8-8a51a0a5e6ef","keyframes":{"transform":["translate3d(0px, 276.98408%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

28. What is Denormalization?

[{"selector":"#anim-d1f5c9b5-e914-4ac7-bbc3-4aeaf77578f7 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-67c5e45e-90f0-415b-bb7e-d26549688142","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-b043e653-b870-4a90-9cbf-be63cd021d3c","keyframes":{"transform":["translate3d(0px, 276.98408%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

29. What are the various forms of Normalization?

[{"selector":"#anim-facc6504-3d69-4b85-a1cd-fda6b7486864 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-78a52013-a09d-4f08-9e13-f33d6e73eff7","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0b6afaff-2d89-4577-8ff9-857ac9a14255","keyframes":{"transform":["translate3d(0px, 211.03550%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

30. What are the TRUNCATE, DELETE and DROP statements?

[{"selector":"#anim-aff0531a-6d7d-47e7-afb9-dec6b819f31f [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-21df7ba1-8c5f-4c72-8816-ff1258e09dfb","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-29841a3a-9266-46c4-97ab-d4b3226873c9","keyframes":{"transform":["translate3d(0px, 170.45176%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

31. What is the difference between DROP and TRUNCATE statements?

[{"selector":"#anim-d8b59512-21fc-43d4-9366-9ffb4a4a2ce5 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f1438499-0996-4eef-824e-a277bcf58631","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-7ad69dcc-887a-4490-8ee0-6e4689455950","keyframes":{"transform":["translate3d(0px, 142.95954%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

32. What is the difference between DELETE and TRUNCATE statements?

[{"selector":"#anim-d0656761-6931-46f9-ab99-81583bef77d6 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f0f9dc10-1722-4127-a64a-5615c940e296","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-83eeb1d8-bd23-4093-8bfc-37090f3e84cf","keyframes":{"transform":["translate3d(0px, 142.95954%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

33. What are Aggregate and Scalar functions?

[{"selector":"#anim-3bed8872-c4b3-49d6-a361-acdacef61e79 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-59e52dc9-cc99-4956-ac04-04e05e849025","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d39a1dcc-d818-4676-bbc6-5053fa594174","keyframes":{"transform":["translate3d(0px, 211.03550%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

34. What is User-defined function? What are its various types?

[{"selector":"#anim-215b06f8-8bb8-403b-8b9e-e2fad5356f27 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-313f2562-21b1-4c17-813a-df932255e098","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6112c082-eca5-4c7d-9fab-2ab854948138","keyframes":{"transform":["translate3d(0px, 170.45176%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

35. What is OLTP?

[{"selector":"#anim-5aa053f3-176d-4ed2-b5fd-665e81c39314 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-02639339-1bbf-492b-b809-a9dff09ed68f","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d1ddc1fa-8790-4eda-97ba-5ae62c314a39","keyframes":{"transform":["translate3d(0px, 402.88590%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

36. What are the differences between OLTP and OLAP?

[{"selector":"#anim-b682c687-67c4-4769-a8c8-446419cedde4 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-fd3066b2-784c-4f35-8886-c3ffe1c87604","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-4c7b99e2-5eaf-432d-8f71-83f97c87e80b","keyframes":{"transform":["translate3d(0px, 211.03550%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

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[{"selector":"#anim-b239dcd3-b401-44aa-8e8e-220cc4acff5c","keyframes":{"opacity":[0,1]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0e15f85d-6ac9-4b9c-bbe6-9cdb0bda53e7","keyframes":{"transform":["translate3d(-126.33136%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-0bf05b79-db14-4539-ac8c-69242a36f56a","keyframes":{"opacity":[0,1]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a5b5b927-1cd8-4b24-b2d5-585bbf2a352e","keyframes":{"transform":["translate3d(-120.51283%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-71b72051-b074-4eeb-9cff-1498813a0e62","keyframes":{"opacity":[0,1]},"delay":200,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-656050aa-c7e6-43a9-8e7d-14383fe32a8c","keyframes":{"opacity":[0,1]},"delay":300,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-cbbfb88a-0941-48dc-8db5-153ad925b9dd","keyframes":{"opacity":[0,1]},"delay":400,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a6ce1a48-375e-44b2-8042-664891a1e857","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-6875094e-74d3-42b2-990e-e6ed4bdc87c8","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-1811ef23-8c48-48e8-a521-6b66410ef04c","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Learn more

37. is Collation? What are the different types of Collation Sensitivity?

[{"selector":"#anim-5835df8c-4a81-46cc-801c-7f78ea32cace [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-7d098a22-94c3-4dfc-a6a7-644f2e84e5e7","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-d2189443-497b-4169-85ef-77d01e1314ba","keyframes":{"transform":["translate3d(0px, 170.45176%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

38. What is a Stored Procedure?

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39. What is a Recursive Stored Procedure?

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40. How to create empty tables with the same structure as another table?

[{"selector":"#anim-9232117b-853c-48ad-8e3a-1f5d282528cd [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(0%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-a9269ac1-d94b-419a-8165-e72455b82d34","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ec5dc511-cb2a-4c2a-a083-adb455d2ecf6","keyframes":{"transform":["translate3d(0px, 170.45176%, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":600,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}]

41. What is Pattern Matching in SQL?

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[{"selector":"#anim-dfb63373-d1ea-4699-8162-59e1b0d01659","keyframes":{"opacity":[0,1]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-bc86388c-4c1a-4a51-9ecd-4e86db37f7cb","keyframes":{"transform":["translate3d(-126.33136%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":100,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-a4e66f9e-1a60-4240-8948-25d083828e23","keyframes":{"opacity":[0,1]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-049894b7-1e46-49f5-8aad-5bb0b4f0beb1","keyframes":{"transform":["translate3d(-120.51283%, 0px, 0)","translate3d(0px, 0px, 0)"]},"delay":0,"duration":800,"easing":"cubic-bezier(0.2, 0.6, 0.0, 1)","fill":"both"}] [{"selector":"#anim-435662b2-face-4c7e-be2e-158e5533258e","keyframes":{"opacity":[0,1]},"delay":200,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-096f1a6a-fc23-437b-8859-5f5243604792","keyframes":{"opacity":[0,1]},"delay":300,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-ffb3615b-c4ad-4632-8dae-acd748474c20","keyframes":{"opacity":[0,1]},"delay":400,"duration":3000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-40779f7c-b19a-43a6-994e-850c1a852d22","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-759e1541-99e0-4501-8339-c7d169727584","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] [{"selector":"#anim-3fda96cd-e7aa-4325-a71a-868342c3a92d","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] Learn more

SQL Interview Questions

SQL Interview Questions

SQL Interview Questions

1. What is Database?

2. What is DBMS?

3. What is RDBMS? How is it different from DBMS?

3. What is RDBMS? How is it different from DBMS?

4. What is SQL?

5. What is the difference between SQL and MySQL?

6. What are Tables and Fields?

7. What are Constraints in SQL?

8. What is a Primary Key?

9. What is a UNIQUE constraint?

10. What is a Foreign Key?

11. What is a Join? List its different types.

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12. What is a Self-Join?

13. What is a Cross-Join?

13. What is a Cross-Join?

14. What is an Index? Explain its different types.

15. What is the difference between Clustered and Non-clustered index?

16. What is Data Integrity?

17. What is a Query?

18. What is a Subquery? What are its types?

19. What is the SELECT statement?

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10 Steps to a Resume That Will Get You Hired

10 Important Career Tips for Women

20. What are some common clauses used with SELECT query in SQL?19. What is the SELECT statement?

21. What are UNION, MINUS and INTERSECT commands?

22. What is Cursor? How to use a Cursor?

23. What are Entities and Relationships?

24. List the different types of relationships in SQL.

25. What is an Alias in SQL?

26. What is a View?

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27. What is Normalization?

28. What is Denormalization?

29. What are the various forms of Normalization?

30. What are the TRUNCATE, DELETE and DROP statements?

31. What is the difference between DROP and TRUNCATE statements?

32. What is the difference between DELETE and TRUNCATE statements?

33. What are Aggregate and Scalar functions?

34. What is User-defined function? What are its various types?

35. What is OLTP?

36. What are the differences between OLTP and OLAP?

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10 New Job Fields for Women in 2022

10 Steps to a Resume That Will Get You Hired

10 Important Career Tips for Women

37. is Collation? What are the different types of Collation Sensitivity?

38. What is a Stored Procedure?

39. What is a Recursive Stored Procedure?

40. How to create empty tables with the same structure as another table?

41. What is Pattern Matching in SQL?

More

Read

10 New Job Fields for Women in 2022

10 Steps to a Resume That Will Get You Hired

10 Important Career Tips for Women