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

Help IBM prioritize your ideas and requests

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.

Receive notification on the decision

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.

Additional Information

To view our roadmaps: http://ibm.biz/Data-and-AI-Roadmaps

Reminder: This is not the place to submit defects or support needs, please use normal support channel for these cases

IBM Employees:

The correct URL for entering your ideas is: https://hybridcloudunit-internal.ideas.aha.io


Status Delivered
Workspace Db2 for z/OS
Created by Guest
Created on May 24, 2021

Different Column Names for Union Query

IBM Db2 z/OS development team to allow different column names in different parts of a UNION clause, as long as their types match, and assign the column names from the first part of the UNION clause to the columns of resulting table

Needed by Date May 31, 2021
  • Guest
    Jun 15, 2021

    Okay thanks.

  • Admin
    Janet Figone
    Jun 15, 2021

    Hello Benjamin, Below please find feedback from development. Thank you.

    Alias can be added as in below. That allows customer to specify column name for the result of UNION.

    SELECT * FROM (

    SELECT C1,C2 FROM T1 UNION

    SELECT C2,C1 FROM T1 UNION

    SELECT C3,C4 FROM T1

    ) AS TX(C1,C2)

  • Guest
    Jun 15, 2021

    Hi,
    Thanks, it seems the problem is an alias cannot be used. The column name returned is a number. For example,
    SELECT
    T1.C1 AS C1Alias
    FROM
    T1
    UNION
    SELECT
    T2.C1
    FROM
    T2
    benjamin

  • Guest
    Jun 15, 2021

    Hi Janet,


    You are right that the query runs fine, but, Db2 assigns standard column names (Col1, Col2) for such result sets. Benjamin was looking for Db2 to assign the column names as C1 and C2 (as they are the column names for the first part of the query) for your example.

  • Admin
    Janet Figone
    Jun 15, 2021

    Hi Benjamin, I'm marking this delivered as it currently supported.

    For example, the following SQL runs successfully on Db2.

    SELECT * FROM (

    SELECT C1,C2 FROM T1 UNION

    SELECT C2,C1 FROM T1 UNION

    SELECT C3,C4 FROM T1

    );

    Please let us know if you have any further questions. Thank you!

  • Guest
    May 27, 2021

    It is never required to have the same column name across union legs. It works as long as data type matches.


    For example, the following SQL runs successfully on Db2.


    SELECT * FROM (

    SELECT C1,C2 FROM T1 UNION

    SELECT C2,C1 FROM T1 UNION

    SELECT C3,C4 FROM T1

    );