mysql子查询的问题

UPDATE

                xxx_zy_supplier_item_id id

                SET `status` = 1

                WHERE

                orderID IN (

                SELECT

                line.salesOrderID

                FROM

                xxx_zy_carrier_note note

                LEFT JOIN

                xxx_zy_carrier_note_line line ON note.mainID =

                line.carrierNoteID

                WHERE

                note.mainID = 'PU20160102124222960'

                ) 

这个sql更新了20多秒

 优化后

 sql语句修改成:

UPDATE

kplus_zy_supplier_item_id id,

(SELECT

line.salesOrderID as orderID

FROM

kplus_zy_carrier_note note

LEFT JOIN

kplus_zy_carrier_note_line line ON note.mainID =

line.carrierNoteID

WHERE

note.mainID = 'PU20160102124222960'

) x 

SET id.status = 1

WHERE

id.orderID=x.orderID