How to create variable in SQL syntax ?

I want to declare a variable like current_dt  for CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME)) and re-use it in place of CAST(&&&&&.) instead of calling that function all the time.

INSERT INTO Table1
SELECT     *
FROM         Table2
WHERE     System_date = CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME))
GO
INSERT INTO Table3
SELECT     *
FROM         Table4
WHERE     System_date = CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME))
GO
INSERT INTO Table4
SELECT     *
FROM         Table5
WHERE     System_date = CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME))
Syd2008Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
here we go (note: remove the GO statements is a must if you want to use a variable)
DECLARE @dt DATETIME
SET @dt = CAST(FLOOR(CAST(GETDATE() AS FLOAT))AS DATETIME)) 
INSERT INTO Table1
SELECT     *
FROM         Table2
WHERE     System_date = @dt 
INSERT INTO Table3
SELECT     *
FROM         Table4
WHERE     System_date = @dt 
INSERT INTO Table4
SELECT     *
FROM         Table5
WHERE     System_date = @dt

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brejkCommented:
Delete one closing parenthesis after DATETIME keyword.
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Syd2008Author Commented:
angelIII:Thanks for your tip actually 'GO' was giving me a problem
brejk: good catch thanks
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Microsoft SQL Server

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