PLSQL Check if varchar2 contains True - sql

Question

I wrote a PLSQL Script which should check if one of the selected rows contains TRUE if yes then he should print me a text.. but he fetches more than one row.
DECLARE
tmp varchar2(20);
BEGIN
Select Status into tmp
From Cdb_Dv_Status;
IF tmp = 'TRUE' THEN
DBMS_Output.put_line('the output is false');
ELSE
DBMS_Output.put_line('the output is true');
END IF;
end;
/
This is what i get when i select it with SQL
NAME STATUS
------------------- -----------
DV_ENABLE_STATUS FALSE
DV_APP_PROTECTION NOT CONFIGURED
DV_CONFIGURE_STATUS FALSE
DV_APP_PROTECTION NOT CONFIGURED
DV_ENABLE_STATUS FALSE
DV_CONFIGURE_STATUS FALSE
DV_APP_PROTECTION NOT CONFIGURED
DV_CONFIGURE_STATUS FALSE
DV_ENABLE_STATUS FALSE
DV_CONFIGURE_STATUS FALSE
DV_APP_PROTECTION NOT CONFIGURED
DV_ENABLE_STATUS FALSE
this doesnt work either.. he tells me i have to declare tmp
BEGIN
for rec in (
select status tmp
from Cdb_Dv_Status
)loop
IF rec.tmp='TRUE' then
dbms_output.put_line('Database Vault wird genutzt');
end if;
end loop;
IF rec.tmp='TRUE' then
dbms_output.put_line('wird genutzt');
ELSE
dbms_output.put_line('Database Vault wird nicht genutzt');
END IF;
end;
/

Answer 1

You may get some too_many_rows or no_data_found exceptions depending on the data for the current case, rather prefer using a COUNT aggregation as in the following code block to check the existence
DECLARE
tmp INT;
BEGIN
SELECT COUNT(*)
INTO tmp
FROM Cdb_Dv_Status
WHERE Status = 'TRUE';
IF tmp > 0 THEN
DBMS_Output.put_line('the output is true');
ELSE
DBMS_Output.put_line('the output is false');
END IF;
END;
/
Demo

Answer 2

If all you need to do is to check if the value 'TRUE' appears at least once in the column STATUS of table (or view) CDB_DV_STATUS, you can do something like this:
declare
str varchar2(5);
begin
select case when 'TRUE' in (select status from cdb_dv_status)
then 'true' else 'false' end
into str
from dual;
dbms_output.put_line('The output is ' || str);
end;
/