Limit the number of rows retrieved

We have the need to limit the number of rows retrieved in a table for some users.

We tried to put this by adding a policy that limits the number of rows. Here is the code:


create or replace function
usu01_access_policy
(obj_schema varchar2, obj_name varchar2) return varchar2
is
d_predicate varchar2 (2000);
Start
If the user = "PEPE01" then
d_predicate: =.
"rownum < 11';
on the other
d_predicate: =.
' 1 = 1' ;
end if;
Return d_predicate;
end;

This code works well when you query the table like this:

Select * from usu01;

the number of rows retrieved is 10.

But when we define a clause 'where' the query does clause 10 recovered lines before, getting only the lines of the first 10 with the condition 'where' = true.

Is there a way to limit the number of retrieved rows from a table, but by first applying the 'where' clause to the whole table and later the ' rownum < limit ' condition?

Thank you

Why do you limit the number of lines of output? It is a customer number, not a database problem, I would say.
Which should be resolved within the query itself. Using rownum without orderly subquery also return different results on each run.
Take a look here for top - N query: http://www.oracle.com/technetwork/issue-archive/2007/07-jan/o17asktom-093877.html

Nicolas.

Tags: Database

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