sql语句中and，or的运算顺序

查询一：select * from orders where orders_status=‘od’ and reship_type=0 or reship_type=1 查询二：select * from orders where orders_status=‘od’ and (reship_type=0 or reship_type=1) 这两个查询获得的结果不同，缘由在于and和or的优先级同

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