临冰听雪丶

摘要： 1 select 重复列，时间列，其余列 2 inner join (select 重复列,max(时间列) as 时间列 from 表 group by 重复列) AS T23 on t1.重复列=t2.重复列 and t1.时间列 =t2.时间列4 from 表 AS T1 阅读全文

摘要： 1 truncate table TableName 阅读全文