本文深入探讨了Oracle数据库中Join操作的使用，包括多表外连、内连、外连的实现方式及应用实例。
oracle中join on 多表外连，内连，外连
比如
select * from A a left join B b on a.xxxx=b.xxx left join C c on a.xxxxxx=c.xxxxx left join D d on a.xxx=d.xx
select * from A a left outer join B b on a.xxxx=b.xxx left join C c on a.xxxxxx=c.xxxxx left join D d on a.xxx=d.xx
比如
select * from A a left join B b on a.xxxx=b.xxx left join C c on a.xxxxxx=c.xxxxx left join D d on a.xxx=d.xx
select * from A a left outer join B b on a.xxxx=b.xxx left join C c on a.xxxxxx=c.xxxxx left join D d on a.xxx=d.xx
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