Could someone please clarify for me if the the resulting order of a UNION
query will come back with the left data first, then the right data in 
the case
that no ordering has been defined for the query.

My need is to have a parameter stored in a database, with an optional
overriding parameter which should take precedence, such as:

select value from param_overrides where key='setting' UNION
select value from params where key='setting'

I'd like the resulting recordset to always contain the override parameter
first if it exists so I can simply use that value.

Thanks, Josh


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