access的多个left outer join连接

虽然你有一万个理由，但是选择ACCESS数据库就是一个不能再蠢的决定。

从AC990账务系统中采集凭证记录，需要做多个左连接。在sql server管理器中执行蛮好，没有问题。可是在程序中就一堆Error。

说左连接。下面代码在管理器查询中执行是ok的。

select (replace(c.pzrq,'.','')+ a.pzlx +right('00000'+cast(a.pzh as varchar(5)),5)) as HDCD_ID,
'101' as HDCD_TypeCode,
'人员经费' as HDCD_TypeName,
c.pzrq as HDCD_Date,
a.zy as HDCD_Summary,
a.kmdm as HDCD_DetailCode,
b.kmmc as HDCD_DetailName,
a.je as HDCD_DetailSum,
'ac990财务软件' as HDCD_Source,
a.pzh as HDCD_SourceNo,
'科室代码' as HD_No,
'科室名称' as HDCD_DeptName,
'科室大类' as HDCD_DeptType
from
(select * FROM [AC990财务软件]...[ID0000_PZGL_D] where  kjn=2021 and kjy=10 and kmdm='100101'
) a
left outer join [AC990财务软件]...[ID0000_YE] b on (a.kmdm=b.kmdm and b.kjn=2021 and b.kjy=10)
left outer join [AC990财务软件]...[ID0000_PZGL_M] c on (a.pzh=c.pzh and c.kjn=2021 and c.kjy=10)
order by a.pzh

在程序中就出错。错误有二个：

1、函数不识别。access有自己简单的函数。需要按照access自己的函数进行修改

2、数据表的表达，不识别。改成标标准格式

3、左连接表达式错误。每个left join需要括号（）成对括起来：from （ （  T1 left join T2  on ...）left join T3  on...）

我们改一下：

select '101' as HDCD_TypeCode,
'人员经费' as HDCD_TypeName,
c.pzrq as HDCD_Date,
a.zy as HDCD_Summary,
a.kmdm as HDCD_DetailCode,
b.kmmc as HDCD_DetailName,
a.je as HDCD_DetailSum,
'ac990财务软件' as HDCD_Source,
a.pzh as HDCD_SourceNo,
'科室代码' as HD_No,
'科室名称' as HDCD_DeptName,
'科室大类' as HDCD_DeptType
from
(
(
(select * FROM ID0000_PZGL_D where  kjn=2021 and kjy=10 and kmdm='100101'
) a
left outer join ID0000_YE b on (a.kmdm=b.kmdm and b.kjn=2021 and b.kjy=10)
)
left outer join ID0000_PZGL_M c on (a.pzh=c.pzh and c.kjn=2021 and c.kjy=10)
)
order by a.pzh