Mysql查询优化随笔记录

select SQL_CALC_FOUND_ROWS * from (select * from  oses_vehdata201606 union all  select * from  oses_vehdata201605)  t where 1=1 and t.Check_Time between '2016-06-23 00:00:00' and '2016-06-23 23:59:59'  order by Check_Time desc select SQL_CALC_FOUND_ROWS * from (select * fro