jsp – jdbc

hi,
i have two tables.

1)Employee
Emp id
Emp name
2)Department
Dep id
Emp id
how can i retrieve data from both tables.
i want to display to select Emp id from Select Box ,it would display Emp id,Emp name,Dep id..using jsp code..
i already relate tables.but i cannot get data due to some errors.
can you please explain detail..