IF EXISTS : Exists « Query « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Query » Exists

1. 10. 5. IF EXISTS


3>

4> CREATE PROCEDURE spTableExists

5>  @TableName VarChar(128)

6> AS

7>  IF EXISTS(SELECT * FROM sysobjects WHERE name = @TableName)

8>  PRINT @TableName + ' exists'

9> GO

1>

2>

3> drop proc spTableExists;

4> GO

1>

2>

1. 10. Exists
	1. 10. 1.	The syntax of a subquery that uses the EXISTS operator
	1. 10. 2.	EXISTS() returns a row in the outer query when any records are returned by a subquery.
	1. 10. 3.	A simple subquery using the EXISTS clause.
	1. 10. 4.	NOT EXISTS with correlated subquery
	1. 10. 5.	IF EXISTS
	1. 10. 6.	A common use for EXISTS is to answer a query such as Show me the titles for which no stores have sales.

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