I'm working on the code written by somebody else. What this code does is
that it makes a query to the DB to obtain a resultset. Then from each row of
the resultset, it repeatedly makes a second query to obtain a second
resultset by using the key field in the first as a key to the second. It is
very obvious that the two queries can be combined with a simple join. But
this person insisted that there are times that cascaded reading of the
resultsets can be faster than a simple join but he couldn't give me an
example. I just wonder if it really can be true and under what circumstances
that reading two resultsets can be faster than a single resultset with a
join when a common key field exists in both tables.
TIA
Received on Thu Jan 24 2002 - 13:13:55 CST
