Question

I want to do a check (if statement) and then create one of two possible procedures.

Right now I am trying to use a IF EXISTS statement inside a CREATE PROCEDURE statement.

CREATE PROCEDURE [dbo].[TestProc]
AS

SET NOCOUNT ON
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER OFF

IF EXISTS (select * from table)
BEGIN
DECLARE @region NVARCHAR(100)

SELECT *
INTO #TempTable
FROM User

…do something with #TempTable etc..

DROP #TempTable
END

ELSE
BEGIN
DECLARE @region NVARCHAR(100)

SELECT *
INTO #TempTable
FROM User

…do something else with #TempTable etc

DROP #TempTable
END

I get the following 2 errors

There is already an object named 'TempTable' in the database.

The variable name '@region' has already been declared. Variable names must be unique within a query batch or stored procedure.

Answer 1

1.You need use two different temp table and before SELECT * INTO statements DROP them

2.Variable need once declared in the body procedure. In your case before IF EXISTS

CREATE PROCEDURE [dbo].[TestProc]
AS
SET NOCOUNT ON
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER OFF

DECLARE @region NVARCHAR(100)

IF EXISTS(SELECT 1 FROM dbo.test6)
BEGIN
  IF OBJECT_ID('tempdb.dbo.#TempTable') IS NOT NULL DROP TABLE dbo.#TempTable
  SELECT *
  INTO #TempTable
  FROM dbo.test6
END
ELSE
BEGIN
  IF OBJECT_ID('tempdb.dbo.#TempTable2') IS NOT NULL DROP TABLE dbo.#TempTable2
  SELECT *
  INTO #TempTable2
  FROM dbo.test6
END