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Transpose RecordSet

Posted on 2004-09-15
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Last Modified: 2012-08-13
I have a sql table with 2 columns "A" and "B".
I want creat one Table that all Record in Columns "A" to change columns and all record in "B" to become Record of new columns

Help me.

Thank you.
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Question by:doanket
3 Comments
 
LVL 9

Expert Comment

by:solution46
ID: 12062403
do you have any sample data, or is this homework?
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LVL 26

Expert Comment

by:Hilaire
ID: 12062473
How many records in your table ?
I think you can't have more than 1024 columns in a SQL Server table.
Also be careful with the maximum row size = 1 physical page = 8060 bytes.
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Accepted Solution

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vidnan123 earned 200 total points
ID: 12063023
Here is one method that I thought for your requirement, though a roundabout one..I would definitely like to see a simpler solution..Anyways, here is my solution...

I have a table called ID with 2 columns ID1 and ID2 with data as follows.

ID1                                                ID2                                                
-------------------------------------------------- --------------------------------------------------
1                                                  11
2                                                  22
3                                                  33
4                                                  44

This query will create a table called IDTEMP with values as follows.


1           2           3           4          
----------- ----------- ----------- -----------
11          22          33          44

Here is the query....

-- First Create the table with column 1 rows as columns for the table
DECLARE @Col1 int,
      @sql nvarchar(1000)

DECLARE curA CURSOR FOR
SELECT distinct ID1 FROM ID

OPEN curA
FETCH NEXT FROM curA INTO @Col1

WHILE @@FETCH_STATUS=0
BEGIN
      if exists (select * from dbo.sysobjects where id = object_id(N'[IDTEMP]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
      BEGIN
            SELECT @sql = 'ALTER TABLE IDTEMP ADD [' + convert(varchar,@Col1) + '] int'
            exec sp_executesql @sql
      END
      ELSE
      BEGIN            
            
            SELECT @sql = 'CREATE TABLE IDTEMP([' + convert(varchar,@Col1)+ '] int)'
            exec sp_executesql @sql
      END      

FETCH NEXT FROM curA INTO @Col1
END

CLOSE curA
DEALLOCATE curA

--Next, update the new table with column 2 rows as column values

DECLARE @TableName nvarchar(256), @ColumnName nvarchar(128), @FormatColName nvarchar(128)

SELECT @TableName='[dbo].[IDTEMP]'
SET @ColumnName = ''

WHILE (@ColumnName IS NOT NULL)
BEGIN
      SET @ColumnName =
      (
            SELECT MIN(QUOTENAME(COLUMN_NAME))
            FROM       INFORMATION_SCHEMA.COLUMNS
            WHERE             TABLE_SCHEMA      = PARSENAME(@TableName, 2)
                  AND      TABLE_NAME      = PARSENAME(@TableName, 1)
                  AND      QUOTENAME(COLUMN_NAME) > @ColumnName
      )

      SELECT @FormatColName =REPLACE(REPLACE(@ColumnName,'[',''),']','')

      IF (SELECT COUNT(1) FROM IDTEMP) = 0
      BEGIN
            select @sql='INSERT INTO IDTEMP(' + @ColumnName + ') SELECT ID2 FROM ID WHERE ID1 = '+@FormatColName
            exec sp_executesql @sql      
      END
      ELSE
      BEGIN
            select @sql='UPDATE IDTEMP SET ' + @ColumnName + '= (SELECT ID2 FROM ID WHERE ID1 = '+@FormatColName + ')'
            exec sp_executesql @sql      
      END      
END

Hope this helps!

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