update wms_cabinet_form set cabf_enabled=0 where cabf_id in ( SELECT wms_cabinet_form.cabf_id FROM wms_cabinet_form Inner Join wms_cabinet ON wms_cabinet_form.cabf_cab_id = wms_cabinet.cab_id Inner Join wms_cabinet_row ON wms_cabinet.cab_row_id =wms_cabinet_row.row_id where wms_cabinet_row.row_site_id=27 and wms_cabinet_form.cabf_enabled=1)
運(yùn)行時(shí)提出如下提示： You can't specify target table 'wms_cabinet_form' for update in FROM clause
運(yùn)行 in 里面的 select 字句:
SELECT wms_cabinet_form.cabf_id FROM wms_cabinet_form Inner Join wms_cabinet ON wms_cabinet_form.cabf_cab_id = wms_cabinet.cab_id Inner Join wms_cabinet_row ON wms_cabinet.cab_row_id =wms_cabinet_row.row_id where wms_cabinet_row.row_site_id=27 and wms_cabinet_form.cabf_enabled=1
可以正確 select 正確結(jié)果。再把結(jié)果直接寫到 in 里面，改后語(yǔ)句如下： update wms_cabinet_form set cabf_enabled=0 where cabf_id in ('113','114','115')，再運(yùn)行可以正確執(zhí)行更新。 到這一步開始想不明白，為什么用 select 子句運(yùn)行會(huì)出錯(cuò)呢？以前在 mssql 這種寫法是很常見(jiàn)的。 沒(méi)辦法了，唯有動(dòng)用 baidu。找到兩條記錄。
update wms_cabinet_form set cabf_enabled=0 where cabf_id in ( SELECT a.cabf_id FROM (select tmp.* from wms_cabinet_form tmp) a Inner Join wms_cabinet b ON a.cabf_cab_id = b.cab_id Inner Join wms_cabinet_row c ON b.cab_row_id = c.row_id where c.row_site_id=29 and a.cabf_enabled=1)
重點(diǎn)在 SELECT a.cabf_id FROM (select tmp.* from wms_cabinet_form tmp) a ，我 select tmp.* from wms_cabinet_form tmp 作為子集， 然后再 select a.cabf_id FROM 子集，這樣就不會(huì) select 和 update 都是同一個(gè)表。致此問(wèn)題得到完美解決。
