PLSQL STORED PROCEDURE does not give result - plsql

Question

select count(*)
INTO countExceed
from uid_emp_master k
where k.unique_id in (select k.reviewer_uid
from uid_rm_hierarchy k
where k.unique_id in ('||p_ID_list||'))
and k.band IN( 'A','B','C','D');
if (countExceed > 0) then
quer :='UPDATE UID_RM_HIERARCHY I
SET I.REVIEWER_UID in (SELECT L.REVIEWER_UID
FROM UID_RM_HIERARCHY L
WHERE L.UNIQUE_ID in ('||p_ID_list||') )
WHERE I.REVIEWER_UID in('||p_ID_list||')
and isdeleted=0';
EXECUTE IMMEDIATE quer ;
END IF;
the above stored procedure does not show any result the variable countExceed declared as a number please help me to correct the query.

Answer 1

The issue is in
where k.unique_id in ('||p_ID_list||'))
Here you are saying to look for records
where unique_id = '||p_ID_list||'
exactly as its typed, but what you need is to handle that variable as a list of values.
Say you have a table like this
create table tabTest(id) as (
select 'id1' from dual union all
select 'id2' from dual union all
select 'id3' from dual union all
select 'id4' from dual
)
and your input string is 'id1,id3,1d8';
I see two ways to do what you need; one is with dynamic SQL, for example:
declare
vResult number;
vList varchar2(199) := 'id1,id3,1d8';
vSQL varchar2(100);
begin
vSQL :=
'select count(*)
from tabTest
where id in (''' || replace (vList, ',', ''', ''') || ''')';
--
execute immediate vSQL into vResult;
--
dbms_output.put_line('Result: ' || vResult);
end;
Another way could be by splitting the string into a list of values and then simply using the resulting list in the IN.
For that, there are many answers about how to split a comma separated list string in Oracle.