如果更新的列值等于'APPROVED'，则触发更新后触发

i had two table named test and test_audit.i had a status column in test table if i updated the status column in test table with value 'APPROVED' then only the after update trigger will be fired.i want query to create trigger (if i update status except 'APPROVED' the trigger will not fire)i had two table named test and test_audit.i had