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>