Why are you contorting yourself into just one query?
Your last clause would be a complete table scan seems to me. Sounds slow
versus 2 queries.
Why can't you just do this? (pseudo code here) -- no table scans involved at
all.
select docid from b where t match 'blah';
if (rowcount > 0) // the we have a b so check for a
mydocid=result
select docid from a where docid=mydocid;
if (rowcount > 0) // then a has the same docid
mydocid=result
end
else // no b exists so a is the only potential one
select docid from a where t match 'blah';
mydocid=result
end
Michael D. Black
Senior Scientist
Advanced Analytics Directorate
Advanced GEOINT Solutions Operating Unit
Northrop Grumman Information Systems
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