PL/SQL code problem for LOV

Question

Hi,
I have developed an application using Apex 4.0
Now, i am trying to make a LOV for two columns in my table. Say column A and column B.
Column A has four different values under it say x,y,z,w and column B has around 3 different values say 1,2 and 3.
How do i write a code for LOV for A and B.
SO that it shows me a drop down list for each and then display results accordingly.
Thanks

Answer 1

user13280446 (mind setting your name?),
The fix for this error is to find the subquery in your SQL that's returning more than one row; generally, you'll want to fix the subquery to return only one row, though in some rare situations it's appropriate to change an = to an in clause.
Example:
select *
from a_table a
where a.col1 = ( select b.col1
                 from b_table b
                 where b.col2 = 42 );Unless b.col2 is guaranteed to be unique (either PK or enforced through a unique constraint), sooner or later that subquery is going to return more than one row, producing the error you're seeing. These variations will all avoid this, though which one (if any) is/are correct is dependent on the data:
select *
from a_table a
where a.col1 = ( select min(b.col1) -- Ensure one row returned
                 from b_table b
                 where b.col2 = 42 );
select *
from a_table a
where a.col1 in ( select b.col1
                 from b_table b
                 where b.col2 = 42 );
select a.*
from a_table a,
    b_table b
where a.col1 = b.col1
    and b.col2 = 42;This is a very contrived example, of course, but without seeing the SQL for your LOV, we can't be any more specific than that...
-David