Sql 访问已存在关系的Dlookup

我有一个事实表，它有一个主键

结束项代码

和一个外键

开始项代码

。主键与dim表项信息表保持连接，外键也可以在该表中。我想得到一个列Dlookup'd，而不是创建另一个查询来连接到我的事实表，但我认为我的语法不正确，而且我找不到任何关于像这样使用Dlookup的人的信息。我做错了什么

特定DLOOKUP代码：

DLOOKUP(" [Descripition] "," [DIM TABLE] ", " FT.[Starting Item Code] = DT.[Item Code] ") AS [Start Item Description]

事实表：

Starting Item Code | Ending Item Code
_____________________________________
1050                 1051

Item Code | Description
_______________________
1050        Chum
1051        Krabby Paddies

SELECT

FT.Starting Item Code,
FT.Ending Item Code,
DT.Description AS [Ending Item Description],

DLOOKUP(" [Descripition] "," [DIM TABLE] ", " FT.[Starting Item Code] = DT.[Item Code] ") AS [Start Item Description]

FROM [Fact Table] AS FT

LEFT JOIN [Dim Table] AS DT
ON FT.[Ending Item Code] = DT.[Item Code]

Starting Item Code | Starting Item Description | Ending Item Code | Ending Item Description
____________________________________________________________________________________________
1050                 Chum                        1051               Krabby Paddies

暗表：

Starting Item Code | Ending Item Code
_____________________________________
1050                 1051

Item Code | Description
_______________________
1050        Chum
1051        Krabby Paddies

SELECT

FT.Starting Item Code,
FT.Ending Item Code,
DT.Description AS [Ending Item Description],

DLOOKUP(" [Descripition] "," [DIM TABLE] ", " FT.[Starting Item Code] = DT.[Item Code] ") AS [Start Item Description]

FROM [Fact Table] AS FT

LEFT JOIN [Dim Table] AS DT
ON FT.[Ending Item Code] = DT.[Item Code]

Starting Item Code | Starting Item Description | Ending Item Code | Ending Item Description
____________________________________________________________________________________________
1050                 Chum                        1051               Krabby Paddies

SQL代码：

Starting Item Code | Ending Item Code
_____________________________________
1050                 1051

Item Code | Description
_______________________
1050        Chum
1051        Krabby Paddies

SELECT

FT.Starting Item Code,
FT.Ending Item Code,
DT.Description AS [Ending Item Description],

DLOOKUP(" [Descripition] "," [DIM TABLE] ", " FT.[Starting Item Code] = DT.[Item Code] ") AS [Start Item Description]

FROM [Fact Table] AS FT

LEFT JOIN [Dim Table] AS DT
ON FT.[Ending Item Code] = DT.[Item Code]

Starting Item Code | Starting Item Description | Ending Item Code | Ending Item Description
____________________________________________________________________________________________
1050                 Chum                        1051               Krabby Paddies

我想要的查询结果：

Starting Item Code | Ending Item Code
_____________________________________
1050                 1051

Item Code | Description
_______________________
1050        Chum
1051        Krabby Paddies

SELECT

FT.Starting Item Code,
FT.Ending Item Code,
DT.Description AS [Ending Item Description],

DLOOKUP(" [Descripition] "," [DIM TABLE] ", " FT.[Starting Item Code] = DT.[Item Code] ") AS [Start Item Description]

FROM [Fact Table] AS FT

LEFT JOIN [Dim Table] AS DT
ON FT.[Ending Item Code] = DT.[Item Code]

Starting Item Code | Starting Item Description | Ending Item Code | Ending Item Description
____________________________________________________________________________________________
1050                 Chum                        1051               Krabby Paddies