Get First/Last Datetime for a date

>>Script Language and Platform: TSQL/SQL Server 2000

If you apply a DatePart function to seperate the date and time, in this case, the index will not be used (because of function usage) and your query may take too much long time.

These two functions will ease your life if you assign the returned values to two variables in use those two variables in your query with syntax.

SELECT listOfColumns
 FROM MyTable
Where TransactionDateTime >= @StartDate And TransactionDateTime <= @endDate

Author: Anjum Niaz

SET QUOTED_IDENTIFIER ON
GO
SET ANSI_NULLS ON
GO
— Returns first moment of any date,
— usefull function to be used
— to calculated before using in
— select statement.
— Highly recommended to optimize
— queries based on datetime
— conditions 
CREATE FUNCTION [GetStartDate]
        (
        @Date DateTime
        )
RETURNS DateTime
AS
        BEGIN
        RETURN Convert(DateTime, Convert(VarChar(30), @Date, 102) + ” 00:00:00.000 AM”, 121) 
        END
GO
CREATE FUNCTION [GetEndDate]
        (
        @Date DateTime
        )
RETURNS DateTime
AS
        BEGIN
        RETURN Convert(DateTime, Convert(VarChar(30), @Date, 102) + ” 11:59:59.998 PM”, 121) 
        END
GO 

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