Using PL/SQL to develop relationship among two tables? - sql

Question

I am new to the PL/SQL language and I am working on a problem and was looking for advice to the right direction to go. Any help would be greatly appreciated!
I have an Employee table and a Building table.
The Employee table consists of Employee_ID, Last_Name, First_Name, and Job(F/P) full or part time.
The Building table consists of Employee_ID and Building_location.(This is the location where the employee works from) either a home or office.
I want the user to type in the last_name from user input. As a result I am looking for the information from the employee: Employee Name, Job (full or part employee) and the building_location. For example, I want my output to look something like this if the user typed in Johnson:
Employee Name Job Position Building Location
====================================================
Andre Johnson Part Time Home Office
Nick Johnson Full Time Downtown Office
If a user types in any string I want to list all Employees who work for the company. But if the name is on the Employee table like 'Johnson' is then it only displays Johnson. Would I need to add in another SELECT clause?
At this point I put together some code that checks if the employee works for the company or not. I am looking to build from this.
ACCEPT p_1 PROMPT 'Please enter the last name of the employee:'
DECLARE
v_name employee.last_name%TYPE := '&p_1';
v_lname employee.last_name%TYPE;
v_fname employee.first_name%TYPE;
v_jobpos employee.job%TYPE;
v_buildtype building.building_type%TYPE;
v_count NUMBER;
BEGIN
SELECT COUNT(*)
INTO v_count
FROM employee
WHERE UPPER(last_name) = UPPER(v_name);
IF v_count = 0 THEN
DBMS_OUTPUT.PUT_LINE('EMPLOYEE NAME Job Position Building Location');
DBMS_OUTPUT.PUT_LINE('----------------------------------------------------' );
for i in (select * from employee order by last_name) loop
DBMS_OUTPUT.PUT_LINE(i.last_name || ', ' || i.first_name)
end loop;
ELSE
for i in (select * from employee order by last_name) loop
DBMS_OUTPUT.PUT_LINE(i.last_name || ', ' || i.first_name);
end loop;
END IF;
END;

Answer 1

You can do this. The simplest way might be like this:
...
IF v_count = 0 THEN
DBMS_OUTPUT.PUT_LINE(v_name || ' Does not work here.');
/* New code starts here! */
DBMS_OUTPUT.PUT_LINE('Employees are:');
for r in (select * from employees) loop
dbms_output.put_line(r.last_name||', '||r.first_name);
end loop;
/* New code ends here! */
ELSE
...
end if;
end;