mysql 按照 where in 排序

select * from user_extend where `unique` in(
'mark.liu@xxxx.com',
'jason.gan@xxxx.com',
'ssgao@xxxx.com',
'andymrlu@xxxx.com'

)
order by field(`unique`,'mark.liu@xxxx.com',
'jason.gan@xxxx.com',
'ssgao@xxxx.com',
'andymrlu@xxxx.com'
) ;