Question

I have a database with a EMPLOYEES table that has the following columns:

(EmpID    char(4) unique Not null,
 Ename    varchar(10),
 Job      varchar(9),
 MGR      char(4),
 Hiredate date,
 Salary   decimal(7,2),
 Comm     decimal(7,2),
 DeptNo   char(2) not null,
     Primary key(EmpID),
     Foreign key(DeptNo) REFERENCES DEPARTMENTS(DeptNo));

With a sample INSERT:

insert into EMPLOYEES values (7654,'Martin','Salesman',7698,'28-Feb-12',1250,1400,30);

I cannot figure out how to list all employees and their managers by manager name. I do not know how to display a manager name, just the number.

Answer 1

The query from your comment is wrong, as it performs the JOIN on the Ename.

Try this:

SELECT 
  manager.Ename as 'Manager Name'
  , e.Ename as 'Employee Name' 
FROM 
  Employees e
  JOIN Employees manager on e.MGR = manager.EmpID;

Your original query joined the table on the name. You should tie the MGR id to the EmpID to find the manager.