• How to write a UNION in SQL without using UNION - Xaprb
  MySQL does not support UNION prior to version 4.0.0, but you can still write a UNION with a mutex table and LEFT OUTER JOIN.
  MySQL does not support UNION prior to version 4.0.0, but you can still write a UNION with a mutex table and LEFT OUTER JOIN.
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  in Programming > SQL with 4.0.0 mysql prior programming sql support union version

4.0.0 from all users