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Hi all,
I have an SQL problem. I have a query like this
select
myfunction(field1) from mytable where field2 like 'A%'
The table mytable
is really big, the selection like 'A%' extracts quickly
only a few records,
while myFunction is a bit slow
A "good" execution plan should extract records
and apply myFuntion to the
results, but the system applies myFunction to the
whole table, and then it
does the filter...it takes forever....
I
tried to rewrite my query this way:
with x as (select field1 from mytable
where field2 like 'A%')
select myfunction(field1) from x
but it's
still very slow!
Can you help
me?
Bye
Franco
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
http://www.francolombardo.net
Scala,
Java, As400.....
http://twitter.com/f_lombardo
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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