Stored pl/sql procedure retrieving similar records from different tables using

Question

Hi all I'm trying to retrieve the employee num and employee name if they are both a driver and mechanic
I'm script my own procedure and it compiles with no issue but when i try to execute it. they will show me this error.
Error starting at line 29 in command:
EXECUTE VERIFY(1,'John Smith')
Error report:
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at "CARSON.VERIFY", line 8
ORA-06512: at line 1
01422. 00000 -  "exact fetch returns more than requested number of rows"
*Cause:    The number specified in exact fetch is less than the rows returned.
*Action:   Rewrite the query or change number of rows requested
This is how my procedure look like:
CREATE OR REPLACE PROCEDURE VERIFY(
enum IN NUMBER,
ename IN VARCHAR) IS
empnum NUMBER;
empname VARCHAR(50);
Fail EXCEPTION;
BEGIN
select employee.e#, employee.name
into empnum, empname
from employee join driver
on driver.e# = employee.e#
join mechanic
on driver.e# = enum;
EXCEPTION
WHEN Fail THEN
dbms_output.put_line('OK');
END VERIFY;
and this is how i execute the procedure
EXECUTE VERIFY(1,'John Smith');
so may i know what have gone wrong? would be glad if someone is able to enlighten me.

Answer 1

No need for a loop.
Just make sure that your query always returns at most one row. Adding a predicate like 'where rownum=1' is a way to achieve that:
select employee.e#
,      employee.name
into   empnum
,      empname
from   employee join driver on driver.e# = employee.e#
                join mechanic on driver.e# = enum
where rownum = 1;