If you are preparing for Data Analyst, Software, or IT roles, SQL is one of the most important skills to master. Many companies like TCS, Infosys, and Wipro frequently ask SQL questions in interviews.
Here are the top SQL interview questions for freshers:
- What is SQL?
SQL (Structured Query Language) is used to store, manage, and retrieve data from databases. - What is the difference between WHERE and HAVING?
WHERE is used to filter rows before grouping, while HAVING is used to filter records after grouping. - What is a JOIN?
A JOIN is used to combine data from two or more tables based on a related column.
Types of JOINs:
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
- FULL JOIN
- What is a Primary Key?
A primary key is a column that uniquely identifies each record in a table. - What is a Foreign Key?
A foreign key is used to link two tables together. - What is normalization?
Normalization is the process of organizing data to reduce redundancy. - What is GROUP BY?
GROUP BY is used to group rows that have the same values. - What is ORDER BY?
ORDER BY is used to sort the result in ascending or descending order.
Preparation Tips:
- Practice SQL queries daily
- Use platforms like LeetCode or HackerRank
- Focus on real-time scenarios
Conclusion:
SQL is a must-have skill for any data-related job. Start practicing today and you can crack interviews easily.
Stay tuned to JobStack India for more interview questions and job updates.