Updation of a table by the values from a different table

Scenario: There are 2 oracle tables TEST1 and TEST2 containing 2 columns each : EMP_ID and EMAIL_ID. How will you update column EMAIL_ID of table TEST1 with the values of EMAIL_ID of table TEST2. The join condition to be used will be on EMP_ID.

Solution:

update test1 set test1.email_id = (select test2.email_id from test2 where test1.emp_id=test2.emp_id)
where
exists (select 1 from test2 where test1.emp_id=test2.emp_id)