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Common Table Expression in SQL Server

By Rohatash Kumar Blogs | SQL Nov 26, 2012
In this blog, I have explained Common Table Expression in SQL Server.

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

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