Deletion\Creation of Temp tables in SQL Server 2008 - sql

Question

I have SQL code like this
IF Object_id('tempdb..#empDate) IS NOT NULL
DROP TABLE #empDate
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
After the above code some more lines of SQL follow and then it is repeated.
I get the following error.
Msg 2714, Level 16, State 1, Line 589
There is already an object named '#empDate' in the database.
I replaced the
IF Object_id('tempdb..#empDate) IS NOT NULL
with
IF Object_id('tempdb..#empDate%) IS NOT NULL
As it is written on the forums that SQL Server appends number to the subsequent temp table(s).
Source:
Check if a temporary table exists and delete if it exists before creating a temporary table
http://blog.sqlauthority.com/2009/05/17/sql-server-how-to-drop-temp-table-check-existence-of-temp-table/
http://blog.sqlauthority.com/2009/03/29/sql-server-fix-error-msg-2714-level-16-state-6-there-is-already-an-object-named-temp-in-the-database/
I am using Microsoft SQL Server 2008 on Windows 7 Enterprise.
I am not able to understand the cause of the error.
Please help.

Answer 1

Sample One
This will fail......
Executing the same code again, will throw the error you are getting now
IF Object_id('tempdb..#empDate') IS NOT NULL
BEGIN
DROP TABLE #empDate
END
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
IF Object_id('tempdb..#empDate') IS NOT NULL
BEGIN
DROP TABLE #empDate
END
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
Sample Two (Fixed)
IF Object_id('tempdb..#empDate') IS NOT NULL
BEGIN
DROP TABLE #empDate
END
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
GO --<-- Adding this Batch Separator will eliminate the Error
IF Object_id('tempdb..#empDate') IS NOT NULL
BEGIN
DROP TABLE #empDate
END
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
Test
If you try Executing the following Statements in ONE BATCH they will fail even though there isnt any table at all with the name #empDate, it will not even execute the very 1st Create table Statement. and will throw an error.
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
DROP TABLE #empDate
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
But if you separate all the statement in separate batches they will be executed successfully something like this..
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
GO
DROP TABLE #empDate
GO
CREATE TABLE #empDate
(
[empID] INT,
[AddLoc] VARCHAR(1000)
)
GO

Answer 2

I would just drop your table without any pre-checks.
Then write/run the script clean.
Once done using the temp table, drop it at the end of your script.
So run this unconditionally
DROP TABLE #empDate
Then write/run your script and make sure you have this line at the end of your script.

Answer 3

pass database name with object_id
example :
DECLARE #db_id int;
DECLARE #object_id int;
SET #db_id = DB_ID(N'AdventureWorks2012');
SET #object_id = OBJECT_ID(N'AdventureWorks2012.Person.Address');
IF #db_id IS NULL
BEGIN;
PRINT N'Invalid database';
END;
ELSE IF #object_id IS NULL
BEGIN;
PRINT N'Invalid object';
END;
ELSE
BEGIN;
SELECT * FROM sys.dm_db_index_operational_stats(#db_id, #object_id, NULL, NULL);
END;
GO