Simple OR condition..but getting prob

Question

Hi all,
Please help me
I am trying to use simple OR condition in a where clause
here is my script
Select * from table 1
where is_numeric(acct_no) = 0 --- is_numeric is function which returns 0 for non digit acc no
or
count_no in ( select count_no from table 1
minus
select count_no from table2)
i dont knw why query is taking a long long time to run w/o out put itired to put braket also but didnt worked.
i knw we can use union too but i dont want to use that.
please help me ....
Thanks
Edited by: user10647455 on Dec 3, 2008 8:04 AM

Answer 1

Hi,
Like Jortri, I would use EXISTS.
I suspect this way is faster:
Select  *
from    table1
where   is_numeric (acct_no) = 0 --- is_numeric is function which returns 0 for non digit acc no
or      NOT EXISTS
        (   select  NULL
            from    table2
            where   count_no = t1.count_no
        );There's no need to reference table1 in the sub-query. You already know count_no exists in table1: that's where you got it.
Calling the PL/SQL function is taking considerable time. If you're only checking for simple types of numbers (such as unsigned integers) you can do that a lot quicker using SQL, especially regular expressions, as Blushadow and Michaels showed you in [your previous thread|http://forums.oracle.com/forums/message.jspa?messageID=3155232#3155232]. If you need to check for any possible number (such as '+1.4E-5') then you probably do need a function. The function may be faster if it is declared as DETEMINISTIC.
Edited by: Frank Kulash on Dec 4, 2008 1:03 PM