The UNION Syntax is:

SELECT ...
UNION [ALL | DISTINCT]
SELECT ...
  [UNION [ALL | DISTINCT]
   SELECT ...]


Lower in the manual it says:
*         A DISTINCT union can be produced explicitly by using UNION
DISTINCT or implicitly by using UNION with no following DISTINCT or ALLkeyword.
*
**
So the thing is DISTINCT is implicit !!!!!

You will need to add after UNION the keyword ALL !

Good luck !

--
Gabriel PREDA
Senior Web Developer

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