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group by cno having count(*) between 100 and 150);

来源:学生作业帮 编辑:神马作文网作业帮 分类:综合作业 时间:2024/11/15 13:16:21
group by cno having count(*) between 100 and 150);
group by cno having count(*) between 100 and 150);
group by子句中如果带有having子句的话,那having子句中的内容相当于where子句里的内容;简单地可以having子句里的内容是查询条件.
再问: having count (*) 怎么解释呢?
再答: 这里其实应该是说要每个分组都要符合以下条件 ( count(*) between 100 and 150)