mysql group by 批量获取最后的数据
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mysql groupy 批量获取最后的数据
1.首先获取最后的数据，先获取id
select max(chapterid) from xx_article_chapter GROUP BY articleid
如果获取第一条数 则需要先进行order 一下
select min(chapterid),articleid from xx_article_chapter GROUP BY articleid
2. 获取对应id后在进行查询
select * from xx_article_chapter where chapterid in ( select max(chapterid) from xx_article_chapter GROUP BY articleid)
3. 基于2个表的更新
update xx_article_article as tablea,
(select * from xx_article_chapter where chapterid in ( select max(chapterid) from xx_article_chapter GROUP BY articleid)) as tableb
set tablea.lastchapter = tableb.chaptername,tablea.lastchapterid = tableb.chapterid where tablea.articleid = tableb.articleid
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