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V2EX  ›  4tograph  ›  全部回复第 1 页 / 共 1 页
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@4tograph
不好意思 ,on 条件忘记写了 。
select a.school_name,b.major_name
from school a
left join major b on a.sid=b.sid
where a.sid in (select sid from school group by sid limit 2)
select a.school_name,b.major_name
from school a
left join major b
where a.sid in (select sid from school group by sid limit 2) 这样对吗?
2019 年 4 月 4 日
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