Question

I’m trying to insert values into an ‘Employee’ table in Oracle SQL. I have a question regarding inputting values determined by a foreign key:

My employees have 3 attributes that are determined by foreign keys: State, Position, & Manager. I am using an INSERT INTO statement to insert the values and manually typing in the data. Do I need to physically look up each reference to input the data or is there a command that I can use? E.g.

INSERT INTO Employee 
(emp_id, emp_name, emp_address, emp_state, emp_position, emp_manager)
VALUES 
(001, "John Doe", "1 River Walk, Green Street", 3, 5, 1000)

This should populate the employee table with (John Doe, 1 River Walk, Green Street, New York, Sales Executive, Barry Green). New York is state_id=3 in the State table; Sales executive is position_id=5 in the positions table; and Barry Green is manager_id=1000 in the manager table.

Is there a way in which I can input the text values of the referenced tables, so that Oracle will recognise the text and match it with the relevant ID? I hope this question makes sense will be happy to clarify anything.

Thanks!

Answer 1

You can expend the following function in order to pull out more parameters from the DB before the insert:

--
-- insert_employee  (Function) 
--
CREATE OR REPLACE FUNCTION insert_employee(p_emp_id in number, p_emp_name in varchar2, p_emp_address in varchar2, p_emp_state in varchar2, p_emp_position in varchar2, p_emp_manager in varchar2) 
RETURN VARCHAR2 AS

   p_state_id varchar2(30) := '';
 BEGIN    
      select state_id 
      into   p_state_id
      from states where lower(emp_state) = state_name;

      INSERT INTO Employee (emp_id, emp_name, emp_address, emp_state, emp_position, emp_manager) VALUES 
                (p_emp_id, p_emp_name, p_emp_address, p_state_id, p_emp_position, p_emp_manager);

    return 'SUCCESS';

 EXCEPTION 
   WHEN others THEN
    RETURN 'FAIL';
 END;
/