延续-SQL调优

SQL Query执行顺序

select distinct<select_list> from join <right_table> on
<join_condition> where <where_condition> group by having limit
<limit_number>

上述SQL查询执行顺序，按标号：
(6) SELECT (6.5)DISTINCT
——————
(1) FROM
(2) JOIN
(3) WHERE
(4) GROUP BY
(5) HAVING
——————
(7) ORDER BY
(8) LIMIT