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select语句关键字的定义的顺序、执行顺序on为什么比where先执行？
大家都这么说：select语句关键字的定义的顺序、执行顺序: (7)SELECT (8) DISTINCT (11) <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>