Creating functions from two tables

Question

So I have these two tables emp and salary. I would like to create a function to accept a grade from salary table
and return number of employes belonging to that specific.Similarly, I would like to create a function to accept the
MGR# from the emp table and return number of employees working under that specific manager.
1.Create function emp_count
(I_grade in number)
return number is
cnt number (2):=0;
begin
Select Count (*) into cnt
from emp, salary e
where e.grade= I_grade;
return (cnt);
end;
2.Create function mgr_count
(I_MGR in number)
return number is
cnt number (2):=0;
begin
Select Count (emp) into cnt
from emp e
where e.mgr= I_mgr;
return (cnt);
end;
Thanks

Answer 1

Joins are same in SQL and PLSQL...
Additional things you can do in PLSQL..
1. Select a single row output in PLSQL variable using INTO
2. Pass a parameter to Select Query
You can also select multirow output in collection type variable.
So coming back to your query write a select query joining emp and salary tables on on grade column (I assume this is the common column between 2 tables) and then filter data using grade input parameter.
Regards
Arun