4.查询数据的最大排序问题(只能用一条语句写) CREATE TABLE hard (qu char (11) ,co char (11) ,je numeric(3, 0)) insert into hard values ('A','1',3) insert into hard values ('A','2',4) insert into hard values ('A','4',2) insert into hard values ('A','6',9) insert into hard values ('B','1',4) insert into hard values ('B','2',5) insert into hard value...
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