小弟初学SQL，实现如题功能，写select distinct filename,sizes from fileDB可以查出这两个字段不同时相同的记录，但是想取得这些记录的ID号，这样写就不对了：select id,distinct filename,sizes from fileDB,请高手帮忙解决，谢谢。
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1、
select max(id) as id,filename,sizes from filedb group by filename,sizes
2、
select * from filedb as a where id in (select max(id) from filedb where a.filename=filename and a.sizes=sizes)