Transformation of data from rows to columns

  • Is there a way in t-sql to transform data stored in row form to column form. By this i mean the following:

    message: type: value

    abc123: ID: 2

    abc123: matl: iron

    abc123: svisor: john

    abc124: ID: 3

    abc124: matl: steel

    abc124: svisor: fred

    become

    message: ID: Matl: Svisor

    Abc123: 2: iron: john

    abc124: 3: steel: fred


    Rlahav

  • For fixed numbers of columns, you can do something like this:

    select message,

    max(case when type='id' then value end) as 'ID',

    max(case when type='matl' then value end) as 'Malt',

    max(case when type='svisor' then value end) as 'Svisor'

    from tbname

    group by message

    If you don't know the #col or want to do dynamically, consider RAC.

    --

    -oj

    http://www.rac4sql.com

  • This is called a pivot table which if is unknown number then there is a piece of code I post in scripts you can use as a blue print to deal with. See http://www.sqlservercentral.com/scripts/scriptdetails.asp?scriptid=204

    "Don't roll your eyes at me. I will tape them in place." (Teacher on Boston Public)

  • Excuse my lack of knowledge but what is "RAC"?

    Thanks in advance

    quote:


    For fixed numbers of columns, you can do something like this:

    select message,

    max(case when type='id' then value end) as 'ID',

    max(case when type='matl' then value end) as 'Malt',

    max(case when type='svisor' then value end) as 'Svisor'

    from tbname

    group by message

    If you don't know the #col or want to do dynamically, consider RAC.

    --

    -oj

    http://www.rac4sql.com


    Rlahav


    Rlahav

  • This is RAC: http://www.rac4sql.com, I guess ojn is a fan user or maybe the CEO 🙂

    By the way, if you retrieve this data in an excel sheet, you can crosstab all you want.

  • You can accomplish it doing full joins.

    Create this table and enter the following data:

    CREATE TABLE [test1] (

    [rowid] [int] IDENTITY (1, 1) NOT NULL ,

    [student] [int] NOT NULL ,

    [Qid] [char] (3) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,

    [ans] [char] (10) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,

    CONSTRAINT [PK_test1] PRIMARY KEY CLUSTERED

    (

    [rowid]

    ) ON [PRIMARY]

    ) ON [PRIMARY]

    GO

    student,qid,ans

    1,Q1,Yes

    1,Q2,No

    2,Q1,No

    2,Q2,No

    Run this query to get the results:

    SELECT distinct r0.Student,r1.q1,r2.q2 FROM [test1] R0

    full join (SELECT student,ans q1 FROM [test1] where qid='Q1') as R1

    on r0.student=r1.student

    full join (SELECT student,ans q2 FROM [test1] where qid='Q2') as R2

    on r0.student=r2.student

  • Silly me, i thought it was a technology (an extension to t-sql)i hadn't heard anything about.

    quote:


    This is RAC: http://www.rac4sql.com, I guess ojn is a fan user or maybe the CEO 🙂

    By the way, if you retrieve this data in an excel sheet, you can crosstab all you want.


    Rlahav


    Rlahav

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