How can I use Common Table Expressions in SQL?

What are Common Table Expressions (CTEs) in SQL?

Common Table Expressions (CTEs) are temporary result sets that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement.

How do I write a simple CTE?

You can write a CTE using the WITH clause. For example:

WITH CTE_Name AS ( SELECT column1, column2 FROM table_name ) SELECT * FROM CTE_Name;.

Can I use CTEs for recursive queries?

Yes, CTEs can be recursive. You define a recursive CTE by referencing itself in the query. This is useful for hierarchical data.

What are the advantages of using CTEs over subqueries?

CTEs improve readability and organization of complex queries, and they can be referenced multiple times within the same query.