土豆爵士(199013129) 20:01:32
select sum(feb) from targetInfo inner join customerInfo on customerInfo.cover=targetInfo.compellation where customerInfo.area='上海' and targetInfo.year='2006'这个语句错在哪里,出来的结果怎么会是正确的2倍
select sum(feb) from targetInfo inner join customerInfo on customerInfo.cover=targetInfo.compellation where customerInfo.area='上海' and targetInfo.year='2006'这个语句错在哪里,出来的结果怎么会是正确的2倍
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