为什么我在这些连接上出现语法错误？

Question

我正在接受

Syntax error in JOIN operation

此查询出错。这表明在连接中的某个地方有一个错位的括号，但我无法弄清楚出了什么问题。

select *
from
((ss
left join
sc
on
ss.guid=sc.guid)
left join
mrc
on
format(c.xDate, "yyyymmddHHMMSS")=mrc.xDate)
left join
c
on
sc.cID=c.id

Answer 1

您收到错误是因为c在定义之前被引用：

select *
from ((ss left join
       sc
       on ss.guid = sc.guid
      ) left join
      mrc
      on format(c.xDate, "yyyymmddHHMMSS") = mrc.xDate
----------------^
     ) left join
     c
     on sc.cID = c.id

您可以通过交换联接来解决此问题：

select *
from ((ss left join
       sc
       on ss.guid = sc.guid
      ) left join
      c
      on sc.cID = c.id
     ) left join
     mrc
     on format(c.xDate, "yyyymmddHHMMSS") = mrc.xDate