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,布布扣,bubuko.com

Access Left Outer Join 关联多个表