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Asked: 2026-05-29T08:00:00+00:00

I would like to make sure that a certain user isn’t existing already in

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I would like to make sure that a certain user isn’t existing already in my system. I have two tables:

  • one with the confirmed users (xymply_users)
  • one with the unconfirmed users (xymply_newusers).

I want to check the guy that’s signed up right now has selected a username not already in either of the tables. I tried this:

SELECT * FROM xymply_users, xymply_newusers 
WHERE xymply_users.user ='test' 
OR xymply_newusers.user ='test'

but if there’s a user ‘test’ in xymply_users it won’t show up with this query, why not I’m wondering?

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1 Answer

  1. Editorial Team

    Use a UNION!

    (SELECT 1 FROM xymply_users WHERE xymply_users.user ='test')
UNION
(SELECT 1 FROM  xymply_newusers WHERE xymply_newusers.user ='test')

    Will give 1 record if the user exists, 2 records if it exists in both, no records if the user doesn’t exist.

    SELECT 1 is just an optimization; it’s faster than SELECT * (SELECT * is usually always wrong)

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