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858C001B

select a.sid, a.score as score1,b.score as score2 from (select * from scoretable where cid='001') a left join (select * from scoretable where cid='002')b on a.sid=b.sid where a.score>b.score

A为源程序,B为目标文件,C为数据文件,D为可执行文件。 当程序未用数据文件时,C是不存在的。

B770京东报价599元

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