mysql 用 group by 查询时，会自动保留 对应组 ‘最先搜索出来的数据’，但这时数据可能不是最新的
如何设置保留 对应组‘最后搜索出来的数据’ 呢？详见代码
对于mysql 5.5版本
select * from (
select * from table_name order by create_time desc
) as t
group by t.id;
对于mysql 5.7及以上版本,需要加入limit限制，否则不生效
select * from (
select * from table_name order by create_time desc limit 100000
) as t
group by t.id;
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