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Operating with #TEMP tables in SQL SERVER

 Temporary tables are created in the TempDB database and can be classified into Local and Global:


  • Local Temporary Tables are created with the prefix "#" and have restricted visibility for the connection responsible for their creation; other connections do not "see" the table.
  • Global Temporary Tables are created with the prefix "##" and are visible by all connections


Syntax:


CREATE TABLE #Tablename

     (

      fieldnameA varchar(80),

      fieldnameB money

     )

Temporary tables are widely used when we need to gather several records from several tables in a single selection and display them in any application (eg Delphi, Visual FoxPro, Visual Studio, ASP.NET, etc.)

Check if a temp table exists and delete if it exists before creating a temp table

IF OBJECT_ID('tempdb..#Tablename') IS NOT NULL DROP TABLE #Results

GO

CREATE TABLE #TableName ( test CHAR(3))

GO

SELECT * from #TableName

GO

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