mysql 多表管理 查詢的時候資料為null
阿新 • • 發佈:2018-12-22
1.1原sql查詢的時候left join的 某張表的資料為null
SELECT t.bill_no billNo, t.item_code itemCode, t.status pickTicketStatus, a.status pickTicketActStatus, i.status outinvStatus, t.flowline flowline, b.crossing crossing, b.rcv_man rcvMan, b.due_date dueDate, o.create_date createTime, o.process_date processTime FROM wms_pick_batch b LEFT JOIN wms_pick_ticket t ON b.id = t.pick_batch_id LEFT JOIN wms_pick_ticket_act a ON t.id = a.pick_ticket_id LEFT JOIN wms_inf_ship_order o ON o.bill_no = t.bill_no LEFT JOIN wms_outinv_detail d ON d.pick_batch_code = t.pick_batch_code LEFT JOIN wms_outinv i ON i.load_no = d.load_no WHERE o.process_status = 1 AND a.status != 2 AND t.bill_no = 'LD000000001024103' ;
1.2 原sql查詢不到資料,因為 a.status 為null !=2 不成立,修改
將 AND a.status != 2
修改為
AND IFNULL(a.status,'') !=2 ;