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mysql中怎么把id相同的num项相加，id不同的保留
select t.id,sum(t.num) numfrom (select * from aunoin allselect * from b) tgroup by t.id以date 分组 对字段B 求和select max(d
select t.id,sum(t.num) numfrom (select * from aunoin allselect * from b) tgroup by t.id以date 分组 对字段B 求和select max(d
