Explain the concept of CTE (common table expression)

CTE (common table expression) is a temporary named result set defined in an SQL query using the WITH keyword.

It enhances the readability and structure of complex queries.

Syntax

MySQL 8.1
WITH CTEName (column1, column2, ...)
AS (
     -- your query
    SELECT ...
)
SELECT * FROM CTEName;

Advantages of CTE

• Improves code readability.
• Allows breaking down complex queries into logical parts.
• Supports recursive queries (recursive CTEs).

A detailed explanation of CTEs can be found in our course.