I'm trying to write some code which has to be useful under many different 
circumstances.  Something I want to be able to do is to take an arbitrary 
SELECT statement and replace the columns which would normally be returned with 
COUNT(*) to find out how many rows would be returned.  To do this I replace the 
text between "SELECT" and "FROM".

I suspect this won't work well with unusual SELECTs which include sub-selects.  
That's okay.

I'm trying to get my head around whether JOINs could be a problem.

Also, does anyone know whether some combination of NULs might make COUNT(*) 
give the wrong result ?

And anything else relevant anyone wants to mention is fine too.

Simon.
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