Using custom functions in a query

Hi, I have a query in a PLSQL procedure where some of the fields are data retreived from custom functions,
i. e.
select a, b, funcThatNeedsA(a), funcThatNeedsB(b)
from xxxx
where ...
but I also could use those functions by making a loop to a cursor
i. e.
cursor c_data is select a, b from xxxx where ...
for r_data in c_data loop
l_a = funcThatNeedsA(r_data.a);
l_b = funcThatNeedsB(r_data.b);
end loop;
So, my question is: what is more efficient, to use the functions directly in the query or in a loop of a cursor?

the overhead of calling your functions will not change based on using them in a loop vs a cursor. the concern is the performance of ANY loop vs not using a loop at all. so what else are you doing in the loop? does it really need to be in a loop? for example, this
insert into a select * from b
is faster than
for rec in (select * from b) loop insert into a values(rec); end loop;

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Dear Gurus,
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Try:
DECLARE
TYPE CRITERIA_LIST_TABLE AS TABLE OF VARCHAR2(20);
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QUERY_STRING VARCHAR2(4000);
BEGIN
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FROM DUAL
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'C2 '||
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END;p.s. not tested
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I
posted
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Asia","") CountryName
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So running this returned the following error:
Query Of Queries syntax error.
Encountered "(. Incorrect Select Statement, Expecting a
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DECODE() is an Oracle function, not generic SQL. Q-of-Q is a
very limited subset of SQL and lacks many functions and clauses
available in standard SQL, especially what you may be used to using
in your particular RDBMS.
See
Query
of Queries user guide
Phil

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using oracle 10g
thank you

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where c.college_id in (121, 123, 124)
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and s.section_id = z.response_id
and z.section_id = s.section_id
[pre]
as you said in your original post, the joins are not all correct (there is NO join to the sections table in your query....i'd assume there should be one.
If the performance of that isn't acceptable you could look into making a materialized view, or a function based index, etc...

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Edited by: Manga Paidikondala on Feb 6, 2011 7:58 AM

Using custom functions in a query

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