如果要针对Access数据库后端编写查询，则需要使用以下联接语法:

If you are writing a query against an Access database backend, you need to use the following join syntax:

select
  t1.c1
, t2.c2
, t3.c3
, t4.c4
from ((t1
inner join t2 on t1.something = t2.something)
inner join t3 on t2.something = t3.something)
inner join t4 on t3.something = t4.something

表名和列名在这里并不重要，但括号的位置很重要.基本上，您需要在from子句后的 n-2 左括号中，在每个新的join子句的开始之前的右括号中，第一个除外，其中第一个 n 是连接在一起的表的数量.

The table and column names aren't important here, but the placement of the parentheses is. Basically, you need to have n - 2 left parentheses after the from clause and one right parenthesis before the start of each new join clause except for the first, where n is the number of tables being joined together.

原因是Access的联接语法一次仅支持联接两个表，因此，如果需要联接两个以上的表，则需要将多余的表括在括号中.

The reason is that Access's join syntax supports joining only two tables at a time, so if you need to join more than two you need to enclose the extra ones in parentheses.