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Status Future consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Jun 30, 2022

Extend FINAL TABLE to MERGE statement

DB2 on z/OS offers the FINAL TABLE with the MERGE statement, however on IBM i this is limited to INSERT only.

Please change DB2 for i to also support FINAL TABLE combined with MERGE.

Use case :

in the query below, which increments a counter, MERGE works as a "black box",

and I can't retrieve directly the new value of the counter :

MERGE INTO COUNTERS A

USING

(VALUES (

CAST( 'YYYYY' AS CHAR(5)), CAST( 'ZZZZZZZ' AS CHAR(7))

)) AS B (TYP_COUNTR, KEY_COUNTR )

ON A.TYP_COUNTR = B.TYP_COUNTR AND A.KEY_COUNTR = B.KEY_COUNTR

WHEN MATCHED AND A.VAL_COUNTR >= 999999999 THEN

UPDATE SET A.VAL_COUNTR = 1

WHEN MATCHED AND A.VAL_COUNTR < 999999999 THEN

UPDATE SET A.VAL_COUNTR = A.VAL_COUNTR + 1

WHEN NOT MATCHED THEN

INSERT ( A.TYP_COUNTR, A.KEY_COUNTR, A.VAL_COUNTR )

VALUES ( B.TYP_COUNTR, B.KEY_COUNTR, 1 )

;

I would like to be able to include the MERGE in a SELECT ... FROM FINAL TABLE, like this :

SELECT VAL_COUNTR FROM FINAL TABLE (

MERGE INTO COUNTERS A ...

);

Here is the documentation of the technique on z/OS :

https://www.ibm.com/docs/en/db2-for-zos/12?topic=operation-selecting-values-while-merging-data

This technique would be helpful to all IBM i developers who code in SQL.



Idea priority High
  • Admin
    Sabine Jordan
    Sep 23, 2022

    The CEAC has reviewed this requirement and recommends that IBM view this as a HIGH priority requirement that is important to address. Having Final Table has the potential to increase the use of Merge because you can get the visibility of what was done in the Merge statement.

    Background: The COMMON Europe Advisory Council (CEAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CEAC has a crucial role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community and has therefore reviewed your RFE.

    To find out how CEAC help to shape the future of IBM i, see CEAC @ ibm.biz/BdYSYj and the article "The Five Hottest IBM i RFEs Of The Quarter" at ibm.biz/BdYSZT

    Sabine Jordan + Sara Anrdres – CEAC Program Manager, IBM

  • Guest
    Jul 27, 2022
    IBM will use this request as input to planning but no commitment is made or implied. This request will be updated in the future if IBM implements it.
  • Guest
    Jul 20, 2022

    just a small addition to the initial request: I just discovered that the RRN() function always returns 1 on the "FROM FINAL TABLE (INSERT...)". Could it be possible to add a RrnParent() function, to retrieve the relative record number of the table impacted by the MERGE command ? This would be very useful for tables from old legacy applications that do not have an auto-increment ID column.

  • Admin
    Nancy Uthke-Schmucki
    Jul 19, 2022

    The CAAC has reviewed this Idea and recommends that IBM view this as a medium priority requirement that should be addressed. Having Final Table has the potential to increase the use of Merge because you can get the visibility of what was done in the Merge statement.


    Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual Ideas on the broader IBM i community, and has therefore reviewed your Idea.


    For more information about CAAC, see www.common.org/caac


    Nancy Uthke-Schmucki - CAAC Program Manager