10 SQL Interview questions for Data Analysts

By Team foundit May 6, 2024

SQL Questions for Data Analysts

[{"selector":"#anim-fe32e742-312e-4f02-8868-0f1682f222b4","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-9302343b-c748-4b71-af30-7f0642bb8422","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-806ba99a-23a3-4779-a952-33c9e489623c","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-939d1ac1-9d9c-4290-8ff5-16b8a0a4e252","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-b2e48354-7f4d-472c-bced-203fb323cb11","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-a3152769-d9d2-43ce-a730-3cca9302b1f2","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Land your dream Data Analyst role in India! Prepare with these top 10 SQL interview questions.

1. What is SQL?

[{"selector":"#anim-575b8304-c1e3-428a-a60a-af6f03ee06ed","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-3cc5875f-e3c9-4afc-be67-f1b6c1145631","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f8011bee-d8a1-40d4-b9d8-fd3f51207b6e","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-12c29d2a-b110-4c15-b775-dabf2ffb4d3c","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-e032f445-fe5e-4d08-ade0-76c15fa9c030","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-6518dc27-0bd4-40a2-9718-8136b56f2581","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Can you explain what SQL is used for?

2. Common SQL Functions

[{"selector":"#anim-5e30add9-1bd3-4bfe-9135-cb565cad792b","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-cd1cd9e9-dccf-4a3a-832d-714f2ddd3d64","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f55e5ade-d511-4b00-a00e-48767547af10","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-258ff34e-2325-4d1e-9746-f8afe1ae8190","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f045dca2-46d3-431c-9031-0315e2e7ed88","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-8fa91fa8-f925-4410-a9b0-448e601285fd","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] What are some frequently used SQL functions?

3. Filtering Data

[{"selector":"#anim-ce6f8793-2535-4311-a60b-2fa202311270","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-4f576663-0759-4fed-a319-fae1dcc2531a","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-67de5f56-e008-45ee-98bb-d371022031b0","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-31d6ff13-b136-4914-b112-99b7cd7528f4","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-6491f5f2-893c-4039-9748-ba4054013a54","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-73c9b365-d4be-400c-b3b0-5189b65f16c3","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] How can you filter data in SQL using the WHERE clause?

4. Join the Tables

[{"selector":"#anim-4912e1a0-5399-46ce-ab7d-8587bc97947e","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-7ae2c714-0db1-4e32-86fe-795321d1ce2b","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-96bf3f70-3e14-4e46-9177-c9db9d60c5e0","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-2b0508ee-d2d7-4615-a008-ed17b3c72584","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-05a4bd76-ba69-4c51-bdfa-27dd2a3a7169","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-c61691d0-246d-4b3c-9a5d-e263d9578418","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Explain the different types of joins (INNER, LEFT, RIGHT) used to combine data from multiple tables.

5. Grouping Data

[{"selector":"#anim-0df894f8-5ba6-4c86-812b-a206d5a16d50","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-ec5946c3-1a03-48d5-bfee-91fc2f8e4ead","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-aa140aa1-d077-4bc9-a175-5fb98e30e5da","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-6f50277c-c5b9-4c89-b07d-3a6740753503","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-eece7615-f886-4834-9eca-8acf63f30b0c","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-e95ab78f-fa2c-4a58-89a6-9134f65be45d","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] How can you group data and calculate aggregate values in SQL?

6. Subqueries

[{"selector":"#anim-be04c391-b48f-43b9-8e63-655f23644ff7","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-29b19f84-43a8-4fa6-9cd6-82e4d14ca232","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-baf1c121-e855-4387-a355-f37dd5275b43","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-c95da416-a2d0-4e62-b943-e08832ddd3e0","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-c08e123f-d00c-4e02-acbc-65622b85bc12","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-2d97ea24-8067-449e-9bb4-a4d6e9bafc86","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] What is a subquery and how can you use it in SQL?

7. Window Functions

[{"selector":"#anim-aabd44c5-756f-425b-aed6-a8f57626b3a1","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-4e911c9a-d007-4144-a876-3571d515972a","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-e01a4018-ce48-478d-9e9a-3c5f0bfd834a","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-7bfb51ac-054a-4f46-aeba-28221a82cc8f","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-5fa5d9f2-a535-40d8-9e98-25a5930a8f6f","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-19fb9688-0285-4308-b518-f4a760b011d0","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] What are window functions and how are they used in SQL?

8. Limit Your Results

[{"selector":"#anim-78e4eedf-ff4a-4cb7-8aa3-e8866acda247","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-a8c05f6e-818a-4c7b-a2e1-7c04f34f44e7","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-8ff3139d-9376-41ef-b594-6f8102c3ed1a","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-14329429-9037-42c3-847f-07f06fc18c2e","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-d2f89c51-d834-4ffa-a092-d162e609906c","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-a065cb10-05a6-4081-9e27-39711ca1cb17","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] How to control the number of rows returned by your query using LIMIT?

9. Sort It Out

[{"selector":"#anim-0aafb0aa-3532-4848-8e7a-61d3595cb465","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-6e55a713-b0d7-4a6f-9871-77c1d5f91bd0","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-f7340c81-9d28-4eef-9cc2-6a39b1237f66","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-f707bd55-d0b5-4030-9eb2-d225f0c00c85","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-d8d68f40-f081-4881-bd0c-1120148975a0","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-af30c342-7baa-4616-9eeb-e7b6308d15d9","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] How to use the ORDER BY clause to sort your query results in ascending or descending order.

10. Beyond the Basics

[{"selector":"#anim-6afa9fdf-de61-43b5-a04f-dcd48d56fcec","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-7bb588e1-c967-4139-b640-a0c0e96b132d","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-56a39450-313d-4720-9b17-512a21a7c582","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-4022ecb9-fbc4-49f2-bb2d-22535129f296","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-0fe45df4-e84a-4346-9893-e9c30ddf5112","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-4d2ed019-9ca6-49da-949e-567f7db71ece","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Can you explain the difference between DDL and DML statements?

Ready To Apply

[{"selector":"#anim-aa2581d1-0f7e-467e-a63a-28d187336e6a","keyframes":{"opacity":[1,1]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-9ff3a1fd-8e9c-41b7-bab5-3cf56cc9e044","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":10,"duration":1500,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-333d6372-dec6-4903-9809-5324285d0fe7","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-89583d57-60c8-40ee-9e57-9cb90a2885c8","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-eed37106-8e25-4bd0-aa62-c8e94bd3e373","keyframes":{"opacity":[0,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-d1d02dbb-e943-4592-b117-db8e9d7f02d5","keyframes":{"transform":["scale(0.3333333333333333)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Don't wait! Update your resume and register at foundit to apply for these exciting opportunities. Register Now