Oracle Where with variable - oracle

Question

I have problem with my plsql code. It's just part of my whole job.
declare
id number(2):=1; (here is function which returns any value)
check VARCHAR2(100);
begin
select COUNT(*) into check from T_SDSN_LOG Where ANY_ID=id AND CHECK LIKE
'NAME';
dbms_output.put_line(check);
end;
In this case, my select returns 0 althought it should be 2.
If I change the part
Where ANY_ID=id to
Where ANY_ID=2 it works perfectly. Any advices? I need id to be variable as a return value from function.

Answer 1

This uses a locally defined function so it isn't available in the SQL but can be referenced in the PL/SQL.
DECLARE
lnum_id NUMBER := return_id;
lnum_check VARCHAR2(100);
FUNCTION return_id
RETURN NUMBER
IS
BEGIN
RETURN 123456;
END;
BEGIN
lnum_id := return_id;
SELECT COUNT(*)
INTO lnum_check
FROM my_table
WHERE table_id = lnum_id;
DBMS_OUTPUT.put_line(lnum_check);
END;
You will presumably want this functionality in a package in which case you can declare the function in the package header, write the code for the function in the body and then reference it in the SQL itself. So if I declare a function (FNC_RETURN_ID) in a package called PKG_DATA_CHECKS that returns a NUMBER I can do the following;
DECLARE
lnum_id NUMBER;
lnum_check VARCHAR2(100);
BEGIN
SELECT COUNT(*)
INTO lnum_check
FROM my_table
WHERE table_id = (SELECT pkg_data_checks.fnc_return_id FROM dual);
DBMS_OUTPUT.put_line(lnum_check);
END;