Most Asked SQL Interview Questions

In this post, we will check all the resources that you would require to crack Analytics interview’s SQL round. You can very well cover the syllabus of SQL in 7 days with The Data Monk. Just try to follow the resources below. Also, we cover most asked SQL interview questions so that you can be a very strong candidate for any SQL interview round.

The resources are split into 3 parts

1. SQL Blogs on The Data Monk, we cover the most important concepts as well questions that are asked in the interviews
2. SQL Most important concept videos – We have 40+ videos on Youtube Freely available, these are not simple concepts or basic questions(like in other channels). We only concentrate on the most important concepts with respect to the interview questions
3. SQL 550 Interview Questions e-book bundle – This is the master set of questions, learn it and you will be able to solve more than 90% questions in any SQL round

SQL Interview Questions and Blogs

– SQL Blogs:

Coming soon

– SQL interview questions solved and posted by our 22000+ users:

200+ SQL Interview Questions and Answers freely available

SQL Videos

– Complete playlist of SQL –

SQL Complete Playlist – Click here

– List of all the Youtube videos

Fetch Duplicate Rows in SQL – https://youtu.be/MGHNrxsHKcg
Like Operator in sql – https://youtu.be/IqMMbH6Jw0w
Substring and Replace in SQL – https://youtu.be/Pzb9tBdXKyc
Aggregate Functions in SQL – https://youtu.be/6H5neKpUz9E
Cumulative Sum in SQL – https://youtu.be/COEEGPXjNbk
Row number() in SQL – https://youtu.be/1actE8UL4yM
Ntile() – https://youtu.be/xbjyXk7oSdY
Rank vs Dense Rank – https://youtu.be/f32Yne_4G00
Where vs Having – https://youtu.be/rtZpbyyQtVk
Lead and Lag – https://youtu.be/U_OQD3XpagQ
Joins – https://youtu.be/_V38OgS1s5M
Keys – https://youtu.be/yPZG6qurO_Q
1NF and 2NF – https://youtu.be/7CyxIOj9zTs
3 NF and BCNF – https://youtu.be/VuJ7gnaas5k
Most Asked Interview Questions – https://youtu.be/UGTsPRUIkYg
Odd even rows – https://youtu.be/-tLTAuvHAU0
Delete vs Truncate vs Drop in SQL – https://youtu.be/cSM86aZRhMo
SQL Tricky Analytics Interview Questions – https://youtu.be/MRgZKeYx1NY
Binary Tree in SQL – https://youtu.be/oAD-YUafmB8
Joins Advance Interview Questions – https://youtu.be/pf_RdiCBQw4
Facebook SQL Interview Questions – https://youtu.be/LDYdcH82IO0
Tricky SQL Interview Questions Part 2 – https://youtu.be/B8Zy9bcqai0

SQL Interview Questions Master E-book

Crack the SQL Interview with 550 Interview Questions

-SQL Most Asked Interview Questions – 250 Questions
– SQL Solved Questions from Leetcode, GFG, Hackerrank, and other websites – 100 Questions
– SQLZoo complete solution – 100 Questions
– ETL and Data Warehouse Questions – 100 questions
– JSON Tutorial in SQL

Additionally, get 800 SQL Questions and SQL cheat sheets that are created by some of the most renowned SQL teachers for free. This is not a proprietor of The Data Monk and we are making this available for your benefit

Link to the SQL e-book

How to buy the e-book?

Read the post here

SQL Complete Road Map

Day 1: SQL Basics

Topics to Learn:
- What is SQL?
- SQL commands (DDL, DML, DCL, TCL).
- Basic syntax: SELECT, INSERT, UPDATE, DELETE.
Practice:
- Create a table using CREATE TABLE.
- Insert sample data into the table.
- Query the data using SELECT.
Resources:
- Watch beginner SQL tutorials.
- Practice on platforms like SQLZoo or LeetCode SQL.

Day 2: Data Retrieval and Filtering

Topics to Learn:
- Filtering data with WHERE, BETWEEN, IN, LIKE.
- Sorting data with ORDER BY.
- Removing duplicates using DISTINCT.
Practice:
- Write queries to filter data based on conditions.
- Sort and retrieve unique data.
Tip: Experiment with filtering using numeric, text, and date columns.

Day 3: Joins and Relationships

Topics to Learn:
- Types of joins: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN.
- Database relationships: Primary and Foreign keys.
Practice:
- Set up two related tables.
- Write queries using all join types.
- Explore the difference between matched and unmatched results.
Tip: Use visualization tools like dbdiagram.io to understand relationships.

Day 4: Aggregation and Grouping

Topics to Learn:
- Aggregate functions: SUM, AVG, COUNT, MIN, MAX.
- Grouping data with GROUP BY and filtering groups using HAVING.
Practice:
- Calculate metrics like average salary by department.
- Identify groups with specific conditions (e.g., departments with more than 5 employees).
Tip: Combine aggregate functions with filters to see how results differ.

Day 5: Subqueries and CTEs

Topics to Learn:
- Simple and correlated subqueries.
- Common Table Expressions (CTEs).
- Recursive queries.
Practice:
- Write a query to find the second-highest value.
- Use a CTE to simplify complex queries.
Tip: Start with simple subqueries before moving to correlated ones.

Day 6: Advanced SQL and Optimization

Topics to Learn:
- Window functions (ROW_NUMBER, RANK, DENSE_RANK).
- Indexes and their impact on performance.
- Query optimization tips.
Practice:
- Write queries using window functions to rank data.
- Analyze the execution plan for a query.
Tip: Use sample datasets from platforms like Kaggle to practice with larger data.

Day 7: Real-World Scenarios and Wrap-Up

Topics to Learn:
- Writing queries for practical scenarios:
  - Finding duplicates.
  - Joining multiple tables.
  - Updating data based on conditions.
- SQL best practices.
Practice:
- Solve SQL challenges on platforms like HackerRank.
- Attempt real-world problems using datasets.
Tip: Test your skills with interview-style SQL questions.

Final Recommendations

Tools to Use:
- Install MySQL, PostgreSQL, or use online SQL editors like Mode.
- Explore free databases like sakila for practice.
Daily Commitment:
- Spend 2–3 hours daily: 1 hour on learning, 2 hours on practicing.
Stay Consistent:
- Focus on understanding concepts before diving into advanced topics.

By the end of 7 days, you’ll have a solid grasp of SQL fundamentals, hands-on experience with practical queries, and the confidence to tackle interview questions or real-world scenarios.