SQL Interview Questions for Freshers – Easy Guide for Beginners
Are you just out of college and looking for your first IT job? Then you must prepare for SQL questions. Many companies ask basic SQL in interviews, especially for roles like data analyst, tester, backend developer or support. Don’t worry if you’re not from an English-medium background. This blog will explain the most asked SQL questions in simple words.
What is SQL?
SQL means Structured Query Language. It is used to talk to databases. You can use SQL to add new data, find specific records, change existing data, or delete unwanted rows. SQL is used in almost every company that works with data.
Interview Questions Explained
1. What is the use of SQL?
It helps manage large amounts of data stored in tables. You can search, update, filter, and organise information using SQL queries.
2. What is the difference between WHERE and HAVING?
Use WHERE when you want to filter data before grouping it.
Use HAVING after grouping data using
GROUP BY.
3. What is a Primary Key?
Primary Key is a column that makes each row different from others. It helps to identify rows uniquely.
SQL JOINs You Should Know
These are very common in interviews:
INNER JOIN – shows only matching rows
LEFT JOIN – shows all rows from the left table, and only matching from right
RIGHT JOIN – shows all from right, and only matching from left
FULL OUTER JOIN – shows everything from both tables
A Common Coding Task: Second Highest Salary
This type of question is often asked in interviews. You can use this query:
sqlCopyEditSELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees);
It gives you the second highest salary in a table.
Other Basic Topics to Learn
DELETE, TRUNCATE and DROP – to remove data or table
Normalization – organising data to avoid repetition
Foreign Key – connects two tables
Subquery – a query written inside another query
Finding duplicates – use
GROUP BYandHAVING
How to Prepare as a Fresher?
Practice writing queries every day
Use free tools to test your queries
Don’t memorise queries — understand the logic
Try solving real examples like “List all employees who joined after April”
Learn in your own language if it helps — Hindi, Tamil, Telugu, etc.
Final Thoughts
Learning SQL can be easy if you follow a step-by-step approach. Don’t get confused by tough words or long answers. Focus on understanding each topic and solving small problems daily. Slowly, you will gain confidence. With regular practice, you’ll be ready to face SQL questions in any job interview.