Pl/sql Query Urgent

[nenu_devudni]

table for employees .. 3 coulums .. emp id , region , manager id - ref to emp id,
to find out all the employees .. who dont have same region as their manager

[timekiller]

Sel * from Emp a
Inner join Emp b
On a.empid=b.mgrid
And a.rgnid<>b.rgnid