[英]Oracle: SELECT * FROM tablea a, tableb b WHERE a.fielda(+)=b.fieldb — what is (+)?
I cannot understand what the role of the (+) is! 我无法理解(+)的作用是什么! (I "inherited" the statement through the automated update process of an application I am maintaining at the moment).
(我通过我目前维护的应用程序的自动更新过程“继承”了该语句)。
Is this some Oracle-specific operator? 这是一些特定于Oracle的运营商吗? Does it have a special name that I can search for?
它有一个我可以搜索的特殊名称吗? It's kind of hard to google for a plus sign between brackets :)
有点难以谷歌在括号之间的加号:)
它是一个外连接运算符(old-school)。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.