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Multiple Rows into a Single Row

Posted on 2006-10-26
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Last Modified: 2008-03-10
I am trying to join Multiple Rows into a single Row for this stored procedure, so that it will look like the following:

Parameter       Price         Method

Copper            $11            200.8, 6020, 345.1
Arsenic            $11            200.8, 6020

For each unique combination of Parameter and Price. The Method table of course has multiple entries for each parameter, and usually at the same price.

Here is my stored procedure so far:

CREATE PROCEDURE [sp_PriceList2]
AS
SET NOCOUNT ON
DECLARE @price            DECIMAL(7, 2)
DECLARE @prmid            INTEGER
DECLARE @mthdtmp            NVARCHAR(30)
DECLARE @mthdrow            NVARCHAR(200)
DECLARE @my_cur CURSOR
DECLARE @my_cur2 CURSOR
SELECT @mthdrow = ''
SET @my_cur = CURSOR FOR
      SELECT DISTINCT PRM_ID,  MTHD_PRICE FROM PARAMETERS INNER JOIN METHODS ON MTHD_PRMID = PRM_ID
      WHERE MTHD_PRICE > 0

OPEN @my_cur
FETCH NEXT FROM @my_cur INTO @prmid, @price
WHILE @@FETCH_STATUS = 0
BEGIN
      SET @my_cur2 = CURSOR FOR
      SELECT MTHD_REF FROM METHODS WHERE MTHD_PRMID = @prmid AND MTHD_PRICE = @price
      OPEN @my_cur2
      FETCH NEXT FROM @my_cur2 INTO @mthdtmp
      WHILE @@FETCH_STATUS = 0
            BEGIN
                  SELECT @mthdrow = @mthdrow + @mthdtmp + ','
                  FETCH NEXT FROM @my_cur2 INTO @mthdtmp
            END
            CLOSE @my_cur2
            DEALLOCATE @my_cur2
            SELECT DISTINCT PRM_ID, PRM_ABBREV, MTHD_PRICE, @mthdrow FROM PARAMETERS INNER JOIN METHODS ON MTHD_PRMID = PRM_ID
            WHERE PRM_ID = @prmid AND MTHD_PRICE = @price

            SELECT @mthdrow = ' '

FETCH NEXT FROM @my_cur INTO @prmid, @price
END
CLOSE @my_cur
DEALLOCATE @my_cur
GO

This almost does what I want it to. It actually returns about 290 different single line tables. I need someway to merge all those together, and someway to tell when I am on my last Fetch into Cursor 2, so that I can drop that last comma off.


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Question by:Xeavn
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3 Comments
 
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Accepted Solution

by:
rw3admin earned 500 total points
ID: 17815372
Try this
Asssuming you have a table called MyTable as follows

Parameter       Price         Method

Copper            $11            200.8
Copper            $11            6020,
Copper            $11            345.1
Arsenic           $11            200.8
Arsenic           $11            6020

create table #T(Id int identity(1,1),Parameter Varchar(255), price Varchar(255))

Insert #T (Parameter, Price)
select distinct Parameter, Price from MyTable

create table #Final(Parameter Varchar(255), price Varchar(255), Method varchar(8000))
Declare
@ID      int,
@Method Varchar(1000)

Select @ID=1, @Method=''
While @ID<=(Select Max(ID) from #T))
Begin
Select      @Method=@Method+','Method
From      MyTable
Inner Join
      #T
ON      #T.Parameter=MyTable.Parameter and      
      #T.Price=MyTable.Price
Where      #T.ID=@ID

INsert #Final
Select      Parameter,
      price,
      @Method
From      #T
Where      #T.ID=@ID
Select @Method=Left(@Method, Len(@Method)-1)

Select @ID=@ID+1, @Method=''
End

Select * from #Final
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Author Comment

by:Xeavn
ID: 17815649
Thanks rw3admin,

It wasn't completely what I was after, but it was close enough that I was able to figure the rest out on my own.
0
 
LVL 11

Expert Comment

by:rw3admin
ID: 17815689
Thanks,
Yes I didnt mess with your code I just wanted to give you an example, I knew you were intelligent enough to figure how to make it work in your own code.

rw3admin
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