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FREE 30-DAY SERIES

30 Days of SQL Interview
Questions & Answers

A structured SQL interview prep series — one topic per day, from SELECT basics to window functions, CTEs, and real-world analytics scenarios.

30
Days
150+
Questions
Free
Always

Week 1 — SQL Foundations

Day 1Basics

SQL Basics — SELECT, FROM, WHERE

6 questions →

Day 2Basics

ORDER BY, LIMIT and DISTINCT

6 questions →

Day 3Filtering

LIKE, IN, BETWEEN and IS NULL

6 questions →

Day 4Aggregations

Aggregate Functions — COUNT, SUM, AVG, MAX, MIN

6 questions →

Day 5Aggregations

GROUP BY Deep Dive

6 questions →

Day 6JOINs

INNER JOIN

6 questions →

Day 7JOINs

LEFT JOIN and RIGHT JOIN

6 questions →

Week 2 — JOINs & Aggregations

Day 8JOINs

FULL OUTER JOIN and CROSS JOIN

5 questions →

Day 9Subqueries

Subqueries

5 questions →

Day 10CTEs

CTEs — WITH Clause

5 questions →

Day 11Window Functions

Window Functions — ROW_NUMBER, RANK, DENSE_RANK

6 questions →

Day 12Window Functions

Window Functions — LAG and LEAD

5 questions →

Day 13Window Functions

Running Totals and Moving Averages

5 questions →

Day 14Conditional Logic

CASE WHEN

5 questions →

Week 3 — Advanced Queries

Day 15Functions

String Functions

6 questions →

Day 16Functions

Date Functions

6 questions →

Day 17NULL Handling

NULL Handling — COALESCE, NULLIF, IFNULL

6 questions →

Day 18Performance

Indexes and Query Performance

5 questions →

Day 19Advanced

Pivot Tables in SQL

4 questions →

Day 20Data Quality

Data Cleaning in SQL

5 questions →

Day 21Real-World

Real-World Scenario: E-commerce Analytics

5 questions →

Week 4 — Real-World & Interview Prep

Day 22Real-World

Real-World Scenario: HR Analytics

5 questions →

Day 23Real-World

Real-World Scenario: Sales Analytics

5 questions →

Day 24Real-World

Real-World Scenario: Financial Analytics

5 questions →

Day 25Advanced

Stored Procedures and Views

4 questions →

Day 26Patterns

Interview Question Patterns — Find Duplicates, Gaps, Islands

5 questions →

Day 27Interview Prep

SQL for Data Analyst Interviews — Frequently Asked Questions

5 questions →

Day 28Practice

SQL Practice: 10 Mixed Questions

5 questions →

Day 29Interview Prep

SQL Tips That Get You Hired

5 questions →

Day 30Mock Test

Day 30 — Complete SQL Interview Mock Test

6 questions →

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