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SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

CREATE FUNCTION getWeekByDoW

(

      – Add the parameters for the function here

      @date datetime,

    @day    varchar(3)

)

RETURNS datetime

AS

BEGIN

      DECLARE @dowNum   int,

                  @truncDate datetime,

                  @retDate datetime;

 

      select @truncDate = cast(convert(varchar, @date, 101) as datetime)

           ,@dowNum =

                  case

                        when @day = ‘Sun’

                              then 1

                        when @day = ‘Mon’

                              then 2

                        when @day = ‘Tue’

                              then 3

                        when @day = ‘Wed’

                              then 4

                        when @day = ‘Thu’

                              then 5

                        when @day = ‘Fri’

                              then 6

                        when @day = ‘Sat’

                              then 7

                        else 0

                  end

 

      select @retDate = DATEADD(DD, @dowNum - DATEPART(DW, @truncDate), @truncDate)

      RETURN @retDate

END

GO

 

select      getWeekByDoW(getdate(), ‘Sun’) Sun,

            getWeekByDoW(getdate(), ‘Mon’) Mon,

            getWeekByDoW(getdate(), ‘Tue’) Tue,

            getWeekByDoW(getdate(), ‘Wed’) Wed,

            getWeekByDoW(getdate(), ‘Thu’) Thu,

            getWeekByDoW(getdate(), ‘Fri’) Fri,

            getWeekByDoW(getdate(), ‘Sat’) Sat

 

Sun	Mon	Tue	Wed	Thu	Fri	Sat
6/28/2009	6/29/2009	6/30/2009	7/1/2009	7/2/2009	7/3/2009	7/4/2009

 

 

SELECT SERVERPROPERTY('Edition') AS Edition,

       SERVERPROPERTY('ProductLevel') AS ProductLevel,

       SERVERPROPERTY('ProductVersion') AS ProductVersion

Edition	ProductLevel	ProductVersion
Enterprise Edition	SP2	9.00.3282.00

 Somehow, there’s no built-in function equivalent to Oracle’s LPAD or RPAD in SQL.  There are several ways to do this, in fact, I posted another way to do RPAD at http://rickcaminiti.com/bi/t-sql-equivalent-of-oracles-rpad/.  Unfortunately, this leaor
ves no way to do an LPAD.

So here’s the scenario:  You have, let’s say an account number that is stored as a number in one system and as a char in another system with leading zeros.  So, 123 might look like 000123 in the other system.  So if you need to represent 123 as 000123, you need to turn it into a char(6) and add 3 zeros to the begining.  That’s exactly what this LPAD function would do. 

CREATE FUNCTION LPAD

               (@SourceString VARCHAR(MAX),

                @FinalLength  INT,

                @PadChar      CHAR(1))

RETURNS VARCHAR(MAX)

AS

  BEGIN

    RETURN

      (SELECT Replicate(@PadChar,@FinalLength - Len(@SourceString)) + @SourceString)

  END

GO

 

 

REATE FUNCTION RPAD

               (@SourceString VARCHAR(MAX),

                @FinalLength  INT,

                @PadChar      CHAR(1))

RETURNS VARCHAR(MAX)

AS

  BEGIN

    RETURN

      (SELECT @SourceString + Replicate(@PadChar,@FinalLength - Len(@SourceString)))

  END

GO

 

 In the example above, you would accomplish this like so:

EXEC dbo.LPAD(Cast(123 AS VARCHAR),6,'0')
OR

SELECT NewString = dbo.LPAD(Cast(123 AS VARCHAR),6,'0')

Here’s where I found it. http://www.sqlusa.com/bestpractices2005/padleadingzeros/

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