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  2. MIDRANGE-L
  3. February 2011

Re: UPDATE Statement

Ryan,

No, you cannot use a CTE with UPDATE or DELETE. I wish we could in some
situations.

So it is something like:

UPDATE my file a
SET myfield = (SELECT field2 FROM file2 b WHERE a.field =b.field)
WHERE a.field IN(SELECT field FROM file2)

And of course, only one row should be returned with the inner selects.

With regards,
Carel Teijgeler

*********** REPLY SEPARATOR ***********

On 14-2-2011 at 10:52 Ryan Hunt wrote:

Is a subselect / correlated subquery the only way to update a table with
info from another (don't want to update the entire row).

In other words, does DB2/400 have something compatable with:

WITH cte AS (
SELECT keycol1, datacol1, datacol2
FROM x, y, z
WHERE x, y, z)

UPDATE TableX --same table as FROM below
SET datacol3 = cte.datacol1, datacol4 = cte.datacol2
FROM TableX
INNER JOIN cte ON cte.keycol1 = TableX.keycol1



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