What is CTE in SQL Server with example?

Question

CTE was introduced in SQL Server 2005, the common table expression (CTE) is a temporary named result set that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement. You can also use a CTE in a CREATE a view, as part of the view's SELECT query. 23 сент. 2021 г.

How does CTE works in SQL Server?

A CTE (Common Table Expression) is a temporary result set that you can reference within another SELECT, INSERT, UPDATE, or DELETE statement. They were introduced in SQL Server version 2005. They are SQL-compliant and part of the ANSI SQL 99 specification. A SQL CTE always returns a result set.

What is CTE and when we should use it?

Defining CTE simply means writing a SELECT query which will give you a result you want to use within another query. As you can see, it is done using a WITH statement. For this reason, CTEs are also called WITH queries. After the WITH, you define a CTE in parenthesis.

What are types of CTE SQL Server?

Common Table Expressions (CTE) have two types, recursive and non-recursive.

What is difference between CTE and temp table in SQL Server?

This biggest difference is that a CTE can only be used in the current query scope whereas a temporary table or table variable can exist for the entire duration of the session allowing you to perform many different DML operations against them.

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