how can show data from two table

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Hi all,
I have 2 tables department(with columns depID and Departmentname)and employee(with columns EmpID,Emp_name,DepID1,DepID2).
I resultant table as
EmpID,Emp_name,Departmentname,Departmentname
i need the query which gives me above resultant table.
Explain my query
what i want is a result which is similar to employee table but the dep_id1, dep_id2 should replaced wit respective departmentname from department table.
Suppose an employee belongs to 2 departments then
i need the result as
empid,empname,departmentname, departmentname

Posted 10-Jul-11 14:28pm

shilpa-pandit

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Christian Graus · Answer 1 · 2011-07-10T14:35:00

This is the most basic SQL you could ever write. It's called an inner join, where you join two tables together by using a value common to both, in this case, the depID. As you have two tables, you need to join twice, as in

SQL

select E.EmpID, E.Emp_Name, d1.DepartmentName, d2.DepartmentName from Employee e inner join department d1 on e.DepID1 = d1.DepID inner join department d2 on e.depID2 = d2.DepID

You should buy a basic SQL book and read it.