Cannot access temporary tables from within a function.

Error Message:
Msg 2772, Level 16, State 1, Procedure MyDate, Line 8
Cannot access temporary tables from within a function.

Severity level:
16.

Description:
This error message appears when you try to access a temporary table from within a user-defined function.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Errors of the Severity Level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. You cannot access a temporary table from within a function.

Versions:
This error message was introduce with SQL Server 2000.

Example(s):
USE tempdb;
GO
IF OBJECT_ID(‘tempdb..#t’) > 0
 DROP TABLE #t
GO
CREATE TABLE #t
(
 id INT NOT NULL
);
GO
IF OBJECT_ID(‘dbo.MyInt’, ‘function’) > 0
 DROP FUNCTION dbo.MyDate
GO
CREATE FUNCTION dbo.MyDate(@i AS INT)
RETURNS INT
WITH EXECUTE AS CALLER
AS
BEGIN
 RETURN (SELECT id
           FROM #t
          WHERE id = @i)
END;
GO

Remarks:
In the above example we try to access the temporary table #t from within the user-defined function MyInt. This raises the error.




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