Pivoting in DB2

I have to transpose my rows into columns from a DB2 table.This is how my table is structured..

ItemID    Item    Value
---------------------
1     Meeting     Now
1     Advise      Yes
1     NoAdvise    No
2     Meeting     Never
2     Advise      No
2     NoAdvise    Null
2     Combine    Yes

I want this to be transposed into(note that I do not want to transpose Combine)

ItemID    Meeting  Advise   NoAdvise 
---------------------------------------
1         Now      Yes       No
2         Never    No        Null

Bit struggling with the query, can you please help?


The currently accepted answer by bhamby is certainly correct, but it's worth checking if using several correlated subqueries is much slower than a single group by (hint: it most likely is):

SELECT 
  A.ItemID,
  MAX(CASE WHEN A.Item = 'Meeting'  THEN Value END) AS Meeting,
  MAX(CASE WHEN A.Item = 'Advise'   THEN Value END) AS Advise,
  MAX(CASE WHEN A.Item = 'NoAdvise' THEN Value END) AS NoAdvise
FROM A
GROUP BY A.ItemID

It's also a bit simpler in my opinion

SQLFiddle (in PostgreSQL, but works on DB2 LUW as well)


It's not very pretty, but it should work. DB2 doesn't have a built-in PIVOT function, like SQL Server.

SELECT DISTINCT
     A.ItemID
    ,(SELECT value
      FROM table B
      WHERE B.ItemID = A.ItemID
        AND B.Item   = 'Meeting'
    ) AS Meeting
    ,(SELECT value
      FROM table B
      WHERE B.ItemID = A.ItemID
        AND B.Item   = 'Advise'
    ) AS Advise
    ,(SELECT value
      FROM table B
      WHERE B.ItemID = A.ItemID
        AND B.Item   = 'NoAdvise'
    ) AS NoAdvise
FROM table A