下面有两种方法可以实现:
(1)
selet tt.id,tt.newsID,tt.comment,tt.theTime from(
select id,newsID,comment,theTime from comments order by theTime desc) as tt group by newsID
(2)
select id,newsID,comment,theTime from comments as tt group by id,newsID,comment,theTime having
theTime=(select max(theTime) from comments where newsID=tt.newsID)
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