使用表的行更新列，而不使用游标或任何其他迭代

Question

alt text http://img248.imageshack.us/img248/1797/updatetable.png

使用每个OrderId的CategoryCode更新Combined列。在这个例子中有两个OrderIds 990和986.需要单独连接这两个类别。

期望的结果是这样的。

990 Bus, Pub, Shoot, Club, Bus, Hos

感谢。

Answer 1

UPDATE test
SET    combined = Left(j.combined, Len(j.combined) - 1)
FROM   test t
   JOIN (SELECT a.orderid,
                (SELECT categorycode + ','
                 FROM   test b
                 WHERE  b.orderid = a.orderid
                 ORDER  BY orderid
                 FOR XML PATH('')) AS combined
         FROM   test a
         GROUP  BY orderid) AS j
     ON j.orderid = t.orderid