SQL Common Table Expression (CTE)
SQL
Server has a very powerful feature has
been added for the programmers' benefit: Common Table Expression (CTE).
Common Table Expressions, or CTE, are a new construct introduced in Microsoft
SQL Server 2005 that offer a more readable form of the derived table that can be
declared once and referenced multiple times in a query.
We have a simple table
Employee
in our database.
![Employee-table-in-Sql-Server.jpg]()
Example
;WITH
EmployeeCTE
AS
(
SELECT
[EmpID]
,[EmpName]
,[EmpSalary]
FROM
[master].[dbo].[Employee]
WHERE
[EmpSalary]>4000
)
SELECT
*
FROM
EmployeeCTE
Now press F5 to execute.
Output
![CTE-in-Sql-Server.jpg]()