PL/SQL multiply Sql statements with if and then - sql

Question

Im trying to write a PL/SQL Code which should ask if something is there count it and
if tmp > 0
so if the object = 'VALID' then execute the rest of the sql statements if not skip everything in the Then case. When I Execute my code it dont execute the code.
DECLARE
tmp INT;
BEGIN
SELECT COUNT(*)
INTO tmp
FROM CDB_registry
WHERE Status = 'VALID';
IF tmp > 0 THEN
Col c.Status Format A6
Col Containers Format A20
Select c.Status, v.name as Containers
From Cdb_Ols_Status c, V\$Containers v
Where c.con_id = v.con_id
And c.Name = 'OLS_DIRECTORY_STATUS'
Order By v.Con_ID;
prompt ****************************************************************************************
DECLARE
tmp INT;
BEGIN
SELECT COUNT(*)
INTO tmp
FROM Cdb_Ols_Status
WHERE Status = 'TRUE'
AND name = 'OLS_DIRECTORY_STATUS';
IF tmp > 0 THEN
DBMS_Output.put_line('The Output is true');
ELSE
DBMS_Output.put_line('The Output is wrong');
END IF;
END;
/
ELSE
DBMS_Output.put_line('There is no value');
END IF;
END;
/

Answer 1

Here's one options; I presumed some things (read comments within code) & agree with #gsalem's comment.
You commented that
cdb_ols_status table does not exist when tmp < 0
It means that you'll have to use dynamic SQL (execute immediate) because - if table doesn't exist, code won't even compile. I guess that's why you said that code I previously posted won't work.
DECLARE
tmp INT;
BEGIN
SELECT COUNT (*)
INTO tmp
FROM cdb_registry
WHERE status = 'VALID';
IF tmp > 0
THEN
-- If this SELECT return only 1 row, you could declare local variables to fetch
-- those values INTO them.
-- Otherwise, it depends on what you want to do with them; if you'd just want to
-- DISPLAY their values (which is what your SQL*Plus COL ... FORMAT commands suggest),
-- then see whether a LOOP helps.
FOR cur_r IN ( SELECT c.status, v.name AS containers
FROM cdb_ols_status c, v$containers v
WHERE c.con_id = v.con_id
AND c.name = 'OLS_DIRECTORY_STATUS'
ORDER BY v.con_id)
LOOP
DBMS_OUTPUT.put_line (cur_r.status || ' - ' || cur_r.containers);
END LOOP;
-- The rest of the script should be ran because TMP value is greater than 0.
EXECUTE IMMEDIATE 'select count(*) from cdb_ols_status '
|| q'[where status = 'TRUE' and name = 'OLS_DIRECTORY-STATUS']'
INTO tmp;
IF tmp > 0
THEN
DBMS_OUTPUT.put_line ('The Output is true');
ELSE
DBMS_OUTPUT.put_line ('The Output is wrong');
END IF;
ELSE
DBMS_OUTPUT.put_line ('There is no value');
END IF;
END;
/