mysql的union 查询 分别对子查询语句排序的话 必须带上limit
eg : select * from table order by id desc limit 10 union select * from table order by id desc limit 10
不带limit的话 order by 无效
mysql的union 查询 分别对子查询语句排序的话 必须带上limit
eg : select * from table order by id desc limit 10 union select * from table order by id desc limit 10
不带limit的话 order by 无效