mysql 语句执行顺序
mysql语句的语法模板：
select distinct <select_list>
from
<left_table><join_type> join <right_table> on <join_condition>
where <where_condition>
group by <group_by_rowname>
having <having_condition>
order by <order_by_condition>
limit <limit_number>
mysql的执行顺序如图：
2.
关于mysql5.7 排序ORDER BY ,分组 GROUP BY
遗留问题 mysql derived 操作 是干嘛的
| DERIVED(derived) | 导出表的SELECT(FROM子句的子查询) |
