What is Subquery? | Hands-On | MySQL
In this Hand-On video, you will understand the concept of a subquery.
To learn about the theory and concepts of subqueries, please refer to the following link : • What is Subquery? | MySQL
A subquery, also referred to as a Nested query or Inner query, is a query that is incorporated within another query, such as SELECT, INSERT, UPDATE, or DELETE. The outcome of the inner query is utilized as input or as a condition for the outer query.
Subqueries can be employed in various sections of a SQL statement, including the SELECT, FROM, WHERE, and HAVING clauses. These subqueries are enclosed in parentheses and typically exist within the larger query.
By utilizing subqueries, you can construct more intricate queries and perform advanced filtering, aggregations, and joins based on data from multiple tables. They offer a powerful approach to retrieve and manipulate data in a database.
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