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What is the difference between VARCHAR and CHAR?
Last Updated: December 2, 2025The difference between VARCHAR and CHAR in SQL lies in how they store string data and handle space: Key Differences:...
What is a VIEW in SQL?
Last Updated: December 2, 2025A VIEW in SQL is essentially a virtual table — it does not store data physically, but instead displays data...
What are aggregate functions in SQL?
Last Updated: December 2, 2025Aggregate functions in SQL are functions that perform calculations on a set of values and return a single summary value....
How do you create a new table in SQL?
Last Updated: December 2, 2025To create a new table in SQL, we use the CREATE TABLE statement. This allows us to define the table...
What is the difference between COUNT and SUM functions?
Last Updated: December 2, 2025he COUNT and SUM functions in SQL are both aggregate functions, but they serve different purposes: This returns the total...
How do you insert data into a table in SQL?
Last Updated: December 2, 2025To insert data into a table in SQL, we use the INSERT INTO statement. It allows us to add new...
How do you update a record in a table?
Last Updated: December 2, 2025To update a record in a table in SQL, we use the UPDATE statement along with the SET clause to...
What is the GROUP BY clause used for in SQL?
Last Updated: December 2, 2025The GROUP BY clause in SQL is used to group rows that have the same values in one or more...
How can you add a new column to an existing table?
Last Updated: December 2, 2025To add a new column to an existing table in SQL, we use the ALTER TABLE statement with the ADD...
What is an index?
Last Updated: December 2, 2025In SQL, an index is a database object that improves the speed of data retrieval operations on a table. You...