Re: Update the first 1500 records that need updating

Sue -
I was sooooo close...

Questions:

1) Is the 'derived' table analagous to a table created by a CTE? I tried using a CTE to no avail...

2) I suppose that X below is the name of the 'derived' table?

SELECT R FROM
(
SELECT RRN(F) R from FILEA F where FIELDA='X'
Fetch first 1500 rows only
) X

3) Where would you find documentation for this in the System i online reference books?


- sjl

----- Original Message ----- From: "Sue Romano" <slromano@xxxxxxxxxx>
To: <rpg400-l@xxxxxxxxxxxx>
Sent: Wednesday, December 05, 2007 1:24 PM
Subject: RE: Update the first 1500 records that need updating

FETCH FIRST N ROWS is only supported in the outer level of a query and in a
derived table, not in a subquery (which is where you are trying to use it).
What you can do is push the clause one level deeper into a derived table.

UPDATE FILEA F
SET FIELDA = 'N' where RRN(F) in
( SELECT R FROM
(
SELECT RRN(F) R from FILEA F where FIELDA='X'
Fetch first 1500 rows only
) X
)

This has been supported since V5R2.

Sue Romano
i5/OS SQL parser