Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

How many UNIONs can i use in a single query?

How many UNIONs can i use in a single query?

How many UNIONs can i use in a single query?

Hi all,

I have a rather long query selecting items out of various unconnected areas of the DB. I have a working query including 20 UNIONs but when I add the 21st I am presented with a syntax error DB Errorcode=-201 (standard general syntax code)

each statement in isolation runs fine.

Have i hit a hard limit on number of union allowed? Or is this something i may be able to work around / reconfigure? Appreciate I'll probably be advised to write a better query but the data really is unconnected so I do not see a solution to get all the data onto a single report without using UNION.


RE: How many UNIONs can i use in a single query?

I have never heard of such a limit. Unfortunately because of the different versions of Informix and the tools to build the queries, it would be difficult to be for sure. I would suggest breaking down the query into a smaller query and testing (particularly the area you are having an issue with).

RE: How many UNIONs can i use in a single query?

thanks kray - I will run each segment of query and put output of each into a new temp table and select everything from that once done. Pain but'll do the job and avoid the unions.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close