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How do you use the LIKE operator in SQL?
Last Updated: December 2, 2025The LIKE operator in SQL is used to search for a specified pattern in a column. It’s very useful when...
What is the use of the DISTINCT keyword in SQL?
Last Updated: December 2, 2025The DISTINCT keyword in SQL is used to eliminate duplicate values from the result set, ensuring that only unique records...
Explain the concept of NULL values in SQL.
Last Updated: December 2, 2025In SQL, a NULL value represents missing, unknown, or undefined data. It’s not the same as zero or an empty...
How do you filter records in SQL?
Last Updated: December 2, 2025To filter records in SQL, we primarily use the WHERE clause, which allows us to specify conditions that determine which...
What is the difference between INNER JOIN and LEFT JOIN?
Last Updated: December 2, 2025The main difference between an INNER JOIN and a LEFT JOIN lies in how they handle unmatched rows between the...
What is a JOIN in SQL?
Last Updated: December 2, 2025A JOIN in SQL is used to combine data from two or more tables based on a related column between...
What is the use of LIMIT or TOP in SQL?
Last Updated: December 2, 2025The LIMIT (in MySQL, PostgreSQL, SQLite) or TOP (in SQL Server) keyword in SQL is used to restrict the number...
What is the ORDER BY clause?
Last Updated: December 2, 2025The ORDER BY clause in SQL is used to sort the results of a query in either ascending (ASC) or...
What is the difference between DELETE and TRUNCATE?
Last Updated: December 2, 2025The main difference between DELETE and TRUNCATE in SQL lies in how they remove data and how they handle transactions,...
How do you retrieve unique values from a column using SQL?
Last Updated: December 2, 2025To retrieve unique values from a column in SQL, I use the DISTINCT keyword with the SELECT statement. The DISTINCT...