SQL 350 Practice Questions & Solutions

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Reference
All 350 questions in this guide are written against the sample database below.
2
- 1.1
  Database Schema
- 1.2
  Sample Data
01 Basic Filtering & Aggregation
Foundational SELECT, WHERE, GROUP BY and aggregate-function problems every SQL practitioner must master.
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02 Joins-Based Problems
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03 Duplicates, Ranking & Nth Value
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04 Window Functions in Practice
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05 Date & Time Problems
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06 GROUP BY / HAVING Puzzles
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07 Subqueries & CTEs
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08 String & Pattern Problems
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09 Real Interview Favorites / Hard
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10 Advanced Window Functions & Analytics
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11 Advanced Recursive CTEs & Hierarchies
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12 Complex JOIN Patterns
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13 Advanced Aggregation Pipelines
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14 Schema Modifications & DDL
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15 Performance Tuning & Query Optimization
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16 Senior-Level Interview Challenges
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2 Courses

Free

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7 Lessons

Duration: 10 Weeks

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Level: All levels