下列两个语句select[name]frombookwherebnoin(selectbnofromborrow)和select[name]frombookwhereexists(select*fromborrowwhereborrow.bno=book.bno)查询结果相同。
下列两个语句select[name]frombookwherebnoin(selectbnofromborrow)和select[name]frombookwhereexists(select*fromborrowwhereborrow.bno=book.bno)查询结果相同。
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