Coding Practice

Practice SQL and Python problems with in-browser execution. Build your data engineering skills.

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Problem
Difficulty
Topic
Points
Status
1
Employee Salary Above Average
Easy
Subqueries
+10
⬜
2
Second Highest Salary
Easy
Window Functions
+10
⬜
3
Revenue Running Total
Medium
Window Functions
+20
⬜
4
Sessionize User Events
Medium
Window Functions/Gaps
+20
⬜
5
Year-over-Year Growth
Medium
Window Functions
+20
⬜
6
Deduplicate CDC Events
Medium
CTEs/Dedup
+20
🔒
7
Gaps in Sequential IDs
Medium
Gaps & Islands
+20
🔒
8
Top N Products per Category
Medium
Window Functions
+20
🔒
9
Pivot Monthly Sales
Medium
CASE/Pivot
+20
🔒
10
Customer Retention Cohort
Hard
CTEs/DateMath
+50
🔒
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