For the Basic sorting yes you can only sort by CB fields. For Advanced sorting you can supply your own SQL to sort by. The usergroup table in most cases however is not joined to the query and is handled entirely in a fast indexed subquery so you likely will not be able to sort by it without providing the full subquery for the usergroup table.
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Your subquery can indeed return more than 1 row. You also didn't make the subquery specific to any given user row. You'll need to of course write your subquery to limit the results to 1 encase a user does have more than 1 usergroup. Joining usergroups to the userlist table is inefficient which is why we don't do it anymore as it'd cause a result set of a million users to take 10x as long. It's also an invisible metric to be sorting users by so doesn't really benefit users much.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
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send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.
I think you are right... I will try to work it out another way.
Maybe I'll use a field at registration stage and then sort the user list according to this field. Much easier!