left join 与where 两种关联区别例如：select * from a left join b on a.no=b.no与语句 select * from a,b where a.no=b.no的区别,那个性能更优

left join 与where 两种关联区别例如：select * from a left join b on a.no=b.no与语句 select * from a,b where a.no=b.no的区别,那个性能更优 inner join 与 left join 有何区别? oracle left join的where条件没有吗 a left join b 与 b right join a 是否一样他们的含义是什么 inner join和left join的区别 left join和inner join的区别 为什么 select * from student left outer join takes on true where student.id=takes.id; 运行不了为什么 select * from student left outer join takes on true where student.id=takes.id; 运行不了 这是书上的 left outer join和left join有区别? left join 和 left outer join 有什么区别? left join 和 left outer join 的区别 left join 和 left out join 有什么区别? left join 和 left outer join 的区别 left join 和 left outer join 的区别 SELECT o.partner_id FROM order o LEFT JOIN partner p on p.id=o.partner_id LEFT JOIN team t on t.id$sql=SELECT o.partner_id FROM order o LEFT JOIN partner p on p.id=o.partner_id LEFT JOIN team t on t.id=o.team_id where o.state='pay' and o.pay_time >= 删除怎么用left join left join 和where的问题在一个已经用了from a,b 方法做了联合 还能继续用left join select a.my_name,b.my_name,c.my_name from a,b left join c on c.nid=a.c_id where b.nid=a.b_id 测试代码提示出错.还有什么变通的方法 不 SQL中 inner join、 left join 、right join、 outer join之间的区别 inner join,left join,right join,full join 的区别?最好用例子说明!