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SQL
Mixed & interview problems
Combine everything — the questions interviews love.
0
/ 20 solved
All levels
Basic (5)
Intermediate (7)
Advanced (8)
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Solved
1
Best customers report
Interview
Basic
2
State-wise customers and revenue
Basic
3
Category scorecard
Basic
4
Cancellation rate by city
Basic
5
Products running low
Basic
6
Month-wise new vs returning customers
Interview
Intermediate
7
Basket size
Intermediate
8
Frequently bought together
Interview
Intermediate
9
Referral revenue
Intermediate
10
Payment preference per customer
Intermediate
11
Department health check
Intermediate
12
Students who improved
Intermediate
13
Customer lifetime summary
Interview
Advanced
14
Top product each month
Advanced
15
Churned customers
Interview
Advanced
16
Running revenue with share of year
Advanced
17
Price changes over time
Advanced
18
Employee project load
Advanced
19
Second purchase conversion
Interview
Advanced
20
Executive dashboard row
Interview
Advanced