Load Column From Excel without some values

[#1]

Hello everybody

I have a problem with a load script

I have a fact table with all the information and I need to add a colunm from a Excel File. The problem is that some of the data in the table not apear in the excel File. Example

Fact table (prior Join)

ITEM

00001

00002

00003    

00004

00005

Excel

ITEM          ITEM_KEY

00001          101001   

00004          101004

00005          101005

Fact table (With a simple Join)

ITEM          ITEM_KEY

00001          101001

00002          -

00003          -   

00004          101004

00005          101005

What I need is, if the value item is in the exel (relation table) the field in ITEM_KEY needs to be equal to the value in the excel, but if the value is not in the Excel the Load need to pass the value of the ITEM column. The result I need for the load is the next:

ITEM           ITEM_KEY

00001          101001 (This value is from the Excel)

00002           00002 (This value is from the Item column form the same fact table)

00003           00003 (This value is from the Item column form the same fact table)

00004          101004 (This value is from the Excel)

00005          101005 (This value is from the Excel)

Can anyone could help me

[Josh_Good]

You could use a mapping to do this.  The script below is an example.  Note I used inline loads to get the table in so the script would self contain in the example.

-Josh

FactTable:

Load * Inline [

ITEM

00001

00002

00003

00004

00005

];

Excel:

Mapping Load * Inline [

ITEM, ITEM_KEY

00001, 101001  

00004, 101004

00005, 101005

];

NewFactTable:

Load

    ITEM,

    ApplyMap('Excel',ITEM, ITEM) as ITEM_KEY

Resident FactTable;

Drop Table FactTable;

[#3]

Thanks

Only one more question..

What happen if in the original Fact Table I have like 30 Others columns, I van create this map in form of Join or do you think is better to create another fact table??

[Josh_Good]

My example didn't include the other fields, just included other fields.  Upon reflection I thought I should clarify that you don't need to load the fact table first and then use a resident load, I just did that because I was using an inline load.

Your final script would look more like this:

Excel:

Mapping Load * Inline [

    ITEM,

    ITEM_KEY

FROM 'lib://Folder/ExcelFileName.xlsx'

(ooxml, embedded labels, table is Sheet1);

FactTable:

Load

    ITEM,

    Field1,

    Feild2,

    ....,

    ApplyMap('Excel',ITEM, ITEM) as ITEM_KEY

From SQL Select * From FactTable;