SQL query to convert columns into rows

Question

I have a table as shown below.My question is:How can I convert columns into rows?BTW,I'm using Microsoft SQL Server 2005.

my input Data

  ONAY_ID  sip_RECno    KULLANICI       ONAY
   1           1         user1          true
   2           1         user2          true
   3           1         user3          false
   4           1         user4          true

Output would be

 sip_RECno  user1     user2    user3     user4       

  1          true     true    false    true          

Answer 1

EDIT for new data type revelation...

SELECT sip_RECno, 
    user1 = MAX(CASE WHEN ONAY_ID = 1 THEN CONVERT(TINYINT, ONAY) END),
    user2 = MAX(CASE WHEN ONAY_ID = 2 THEN CONVERT(TINYINT, ONAY) END),
    user3 = MAX(CASE WHEN ONAY_ID = 3 THEN CONVERT(TINYINT, ONAY) END),
    user4 = MAX(CASE WHEN ONAY_ID = 4 THEN CONVERT(TINYINT, ONAY) END)
FROM dbo.tablename
WHERE sup_RECno = 1
GROUP BY sip_RECno;