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SELECT DISTINCT
	<select_list>
FROM 
	<left_table>
	<join_type> JOIN <right_table>
	ON <join_condition>
WHERE 
	<where_condition>
GROUP BY
	<group_by_list>
HAVING
	<having_condition>
ORDER BY
	<order_by_condition>
LIMIT <limit_number>

查询优化器：

FROM 
	<left_table>
	ON <join_condition>
	<join_type> JOIN <right_table>
WHERE 
	<where_condition>
GROUP BY
	<group_by_list>
HAVING
	<having_condition>
SELECT DISTINCT
	<select_list>
ORDER BY
	<order_by_condition>
LIMIT <limit_number>

SQL执行顺序鱼刺图