select a.readerid,a.readerName,count(*) as 借阅数量
from beanreader a join beanbooklendrecord b on a.readerid=b.readerid
group by a.readerid,a.readerName
from beanreader a join beanbooklendrecord b on a.readerid=b.readerid
group by a.readerid,a.readerName
解决方案 »
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