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Select x,y,z from MyFile
where years_experience > 10
or years_college >= 4
or PMP = 'YES'
fetch first row only
...are the clauses tested in order or does the optimizer find one row from
the optimized access path (or through a table scan) regardless of how the
statement is coded and quit?
In this example, the goal is to select a row where years_experience > 10,
and if no rows qualify, select a row where years_college >= 4, and so on.
Other than executing multiple SQL statements, is there a good technique for
controlling the selection process? I'm trying to get my head around an
ORDER BY/CASE construct but I don't quite have it.
Thanks!
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