IBM Data and AI Ideas Portal for Customers

Shape the future of IBM!

We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

Post your ideas

Post ideas and requests to enhance a product or service. Take a look at ideas others have posted and upvote them if they matter to you,

  1. Post an idea

  2. Upvote ideas that matter most to you

  3. Get feedback from the IBM team to refine your idea

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The IBM team may need your help to refine the ideas so they may ask for more information or feedback. The product management team will then decide if they can begin working on your idea. If they can start during the next development cycle, they will put the idea on the priority list. Each team at IBM works on a different schedule, where some ideas can be implemented right away, others may be placed on a different schedule.

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Some ideas can be implemented at IBM, while others may not fit within the development plans for the product. In either case, the team will let you know as soon as possible. In some cases, we may be able to find alternatives for ideas which cannot be implemented in a reasonable time.

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Status Not under consideration
Workspace Db2
Created by Guest
Created on Feb 2, 2017

CASE with EXISTS in UPDATE returns SQL0582N, which is inconsistent behavior with db2 z/OS

db2 "update test_tab set c1=case when exists (select
c2 from test_tab where c2=1) then 'A' else 'B' END"
DB21034E The command was processed as an SQL statement because it was
not a valid Command Line Processor command. During SQL processing it returned:
SQL0582N A CASE expression in a VALUES clause, IN predicate, GROUP BY clause,
or ORDER BY clause cannot include a quantified predicate, an IN
predicate using a fullselect, or an EXISTS predicate. SQLSTATE=42625

However, CASE with EXISTS in UPDATE works in DB2 Z/OS.