← Blog30 Days of SQL Interview
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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