Access Left Outer Join 关联多个表

Access 支持三表或三表以上的 join 操作,但是要加括号,一层一层 JOIN 下去

例子:
1、SELECT * from XXas a left outer join YY as b  on a.URL=b.URL 

2、SELECT * from (XXas a left outer join YY as b  on a.URL=b.URL)   left outer join ZZ as c on c.URL=a.URL

3、SELECT * into all_ from ((((XX as a left outer join YY as b  on a.URL=b.URL) 

 left outer join ZZ as c on c.URL=a.URL)
 left outer join MM as d on d.URL=a.URL)
 left outer join NN as e on e.URL=a.URL)

Access Left Outer Join 关联多个表,古老的榕树,5-wow.com

郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。