🔹Notes: https://www.gatesmashers.com/resources/sql-interview-questions
00:00 Q-1: Write a question to show all Engineering workers ordered by wage from highest to lowest.
05:40 Q-2: Write a question to seek out the variety of workers in every division.
08:50 Q-3: Write a question to seek out the second-highest distinct wage.
11:02 Q-4: Write a question to seek out workers incomes greater than the corporate common wage.
11:56 Q-5: Write a question to seek out the very best wage in every division.
13:55 Q-6: Write a question to seek out workers whose wage is larger than their supervisor wage.
17:31 Q-7: Write a question to show every order with the shopper identify.
19:50 Q-8: Write a question to seek out clients who’ve by no means positioned an order.
21:43 Q-9: Write a question to seek out clients who positioned a couple of order.
24:28 Q-10: Write a question to seek out the highest-spending buyer primarily based solely on delivered orders.
26:36 Q-11: TRUNCATE vs DELETE — Remove all rows rapidly whereas retaining the desk.
28:15 Q-12: GRANT SELECT — Give an intern read-only entry to the Employees desk.
30:05 Q-13: SQL Logical Execution Order — Why cannot SELECT aliases be used in WHERE?
31:55 Q-14: ROW_NUMBER() vs RANK() vs DENSE_RANK()
33:50 Q-15: COUNT(*) vs COUNT(electronic mail) vs COUNT(DISTINCT electronic mail)
35:54 Q-16: COALESCE() — Return the primary out there non-NULL worth.
38:06 Q-17: LAG() — Find every consumer’s earlier login date.
42:45 Q-18: CASE — Classify workers into Low, Medium, and High wage bands.
43:45 Q-19: NULLIF() — Prevent divide-by-zero errors.
45:22 Q-20: Delete duplicate information whereas retaining the latest file for every electronic mail.
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