𝐏𝐫𝐞𝐩𝐚𝐫𝐢𝐧𝐠 𝐟𝐨𝐫 𝐚𝐧 𝐒𝐐𝐋 𝐢𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰? 𝐇𝐞𝐫𝐞 𝐚𝐫𝐞 𝐬𝐨𝐦𝐞 𝐜𝐫𝐮𝐜𝐢𝐚𝐥 𝐒𝐐𝐋 𝐪𝐮𝐞𝐫𝐲 𝐪𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 𝐲𝐨𝐮 𝐬𝐡𝐨𝐮𝐥𝐝 𝐛𝐞 𝐫𝐞𝐚𝐝𝐲 𝐭𝐨 𝐭𝐚𝐜𝐤𝐥𝐞:
1. How do you retrieve all columns from a table?
2. What SQL statement is used to filter records?
3. How can you join two tables? Explain different types of JOINs.
4. What is the difference between WHERE and HAVING clauses?
5. How do you count the number of records in a table?
6. How do you calculate average, sum, minimum, and maximum values in a column?
7. What is a subquery, and how do you use it?
8. Explain the difference between correlated and non-correlated subqueries.
9. How do you optimize a slow-running query?
10. What are indexes, and how do they improve query performance?
11. How do you insert, update, and delete records in a table?
12. What is the difference between TRUNCATE and DELETE statements?
13. How do you create, alter, and drop a table?
14. What are constraints, and how do you implement them?
15. What is a transaction, and why is it important in SQL?
16. Explain COMMIT, ROLLBACK, and SAVEPOINT.
17. What is normalization, and why is it important?
18. Explain the different normal forms (1NF, 2NF, 3NF, BCNF).
19. What are window functions, and how do you use them?
20. Explain ROW_NUMBER(), RANK(), and DENSE_RANK().𝐏𝐫𝐞𝐩𝐚𝐫𝐢𝐧𝐠 𝐟𝐨𝐫 𝐚𝐧 𝐒𝐐𝐋 𝐢𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰? 𝐇𝐞𝐫𝐞 𝐚𝐫𝐞 𝐬𝐨𝐦𝐞 𝐜𝐫𝐮𝐜𝐢𝐚𝐥 𝐒𝐐𝐋 𝐪𝐮𝐞𝐫𝐲 𝐪𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 𝐲𝐨𝐮 𝐬𝐡𝐨𝐮𝐥𝐝 𝐛𝐞 𝐫𝐞𝐚𝐝𝐲 𝐭𝐨 𝐭𝐚𝐜𝐤𝐥𝐞:
1. How do you retrieve all columns from a table?
2. What SQL statement is used to filter records?
3. How can you join two tables? Explain different types of JOINs.
4. What is the difference between WHERE and HAVING clauses?
5. How do you count the number of records in a table?
6. How do you calculate average, sum, minimum, and maximum values in a column?
7. What is a subquery, and how do you use it?
8. Explain the difference between correlated and non-correlated subqueries.
9. How do you optimize a slow-running query?
10. What are indexes, and how do they improve query performance?
11. How do you insert, update, and delete records in a table?
12. What is the difference between TRUNCATE and DELETE statements?
13. How do you create, alter, and drop a table?
14. What are constraints, and how do you implement them?
15. What is a transaction, and why is it important in SQL?
16. Explain COMMIT, ROLLBACK, and SAVEPOINT.
17. What is normalization, and why is it important?
18. Explain the different normal forms (1NF, 2NF, 3NF, BCNF).
19. What are window functions, and how do you use them?
20. Explain ROW_NUMBER(), RANK(), and DENSE_RANK()
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