mysql 函数 select SUBSTRING_INDEX(vPART_ID, '/', 1)

select * from lackgoodsapplybillbase a inner join lackgoodsapplybillinfo b on a.`vLACKGOODSAPPLY_ID`=b.`vLACKGOODSAPPLY_ID` where b.`vPART_ID` not in (select  SUBSTRING_INDEX(vPART_ID, '/', 1) from materbaseinfo)  order by a.dOPERATE_DATE DESC