An SQL developer position is a huge opportunity, and you most certainly want to put your best foot forward in the interview process. According to Glassdoor, SQL developers can typically make an average annual base salary of ₹5,09,000 in India. To perform to the best of your abilities, you must prepare well for the SQL interview. The preparation starts with studying some basic SQL interview questions for freshers.
This is why we have compiled in this blog post the basic SQL interview questions that will likely be asked in an interview.
So, let’s begin!
SQL Interview Questions for Freshers in 2024
Here are some questions and answers:
Q1. What is a Database?
It is an organised data collection that can be stored and retrieved digitally. Databases can be vast, and thus, they need to be developed using fixed design and modelling approaches.
Q2. Differentiate between DBMS and RDBMS?
Q3. Differentiate between SQL and MySQL?
Q4. Discuss the various subsets of Standard Query Language or SQL Commands
Data Definition Language (DDL):
This single column of commands defines the structure of the database server. It includes commands like CREATE, DROP, ALTER, etc.
Data Manipulation Language (DML):
This set of commands is used to modify the created database. It includes commands like SELECT statement, INSERT, UPDATE, etc.
Data Control Language (DCL):
This set of commands provides access control to the database’s data. DCL commands include GRANT and REVOKE.
Transaction Control Language (TCL):
TCL commands help with database transaction operations. They include COMMIT, SAVEPOINT, ROLLBACK, and SET TRANSACTION.
Some more SQL Interview Questions for Freshers:
Q5. Differentiate between Primary Key and Unique Key Value?
Q6. What do you mean by SQL? What are the various types of join in SQL?
SQL joins help you retrieve data from multiple tables and turn it into a meaningful result set. We can fetch data from multiple tables using joins. We can achieve this by using the SELECT statement and join condition.
The various types of join in SQL are:
- INNER JOIN
- LEFT OUTER JOIN
- RIGHT OUTER JOIN
- FULL OUTER JOIN
- SELF JOIN
- CROSS JOIN
Q7. What do you mean by Inner Join in SQL?
Inner join returns rows from two temporary tables when at least one value matches between the rows. It is a default join. Thus, it is optional to add the keyword INNER to the SQL query.
Q8. What is a Constraint? Tell me about the various levels.
Constraints define rules and regulations that restrict or allow what values a table can hold. Constraint ensures data integrity and accuracy within the table. It enforces storing only valid data and does not let us store irrelevant data.
Thus, the action fails if there is any mismatch between the constraint and data action.
Most common constraints include PRIMARY KEY, NOT NULL, AUTO_INCREMENT, FOREIGN KEY, UNIQUE KEY, etc.
Q9. What is a view?
An SQL view is a virtual table based on a statement’s result set. It has rows and columns like a real table, but the fields are taken from one or more tables in a database object.
What Else To Do Apart From Preparing for SQL Interview Questions for Freshers?
In addition to these SQL interview questions for freshers, staying up-to-date with the latest developments in SQL and other programming languages would help you outclass other candidates.
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