sql书写和执行顺序
(8)SELECT (9)DISTINCT<select_list>
(1)FROM <left_table>
(3)<join_type> JOIN<right_table>
(2) ON<join_condition>
(4)WHERE<where_condition>
(5)GROUP BY<group_by_list>
(6)WITH{CUBE|ROLLUP}
(7)HAVING<having_condition>
(10)ORDER BY<order_by_list>
(11)LIMIT <limit_number>
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