Adding a column using a list of distinct values from another tables column

[Timaru_Golf]

Hi,

I have spent some time googling this but maybe not asking the question correctly to find the information....

Anyway what I am trying to do is as followings 

TABLE A 

From this table create a list from a Date column that containts all the unique dates.

Table B

In this Table I want to add a new column that containts the list generated from Table A

Col A	Col B	NEW COL
Fact 1	Fact 1	Table A - List
Fact 2	Fact 2	Table A - List

Once I have this I can then expand the list... so I end up with a table with rows that repeats Fact 2 for all the dates and the same for Fact 2 

Col A	Col B	NEW COL
FACT 1	FACT 1	01/01/2020
FACT 1	FACT 1	08/01/2020
FACT 2	FACT 2	01/01/2020
FACT 2	FACT 2	08/01/2020

I have unsucessfully tried a number of approaches that keep coming up with errors like

So the question is does anyone know how to do this?

Thanks in advance

[parry2k]

@Timaru_Golf use CROSSJOIN DAX function to get the expected result.

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[Timaru_Golf]

Sorry forgot to mention this is within M code

[HotChilli · Accepted solution]

Writing code in the advanced editor is an option but it wouldn't be my first thought.

Use the 'Add Column' tab in the editor.

I'm not going to write the line for you as you're nearly there.

[Timaru_Golf]

Thanks I was over thinking it - works a treat.

 // Create Unique DATE column
    #"Removed Other Columns1" = Table.SelectColumns(#"Remove KEY",{"Report Date"}),
    #"Report Date" = Table.Distinct(#"Removed Other Columns1"),

// Create Fact table expanded by Dates
    #"Removed Other Columns" = Table.SelectColumns(#"Remove KEY",{"COUNTRY", "CustomerName", "CustomerNumber", "Class"}),
    #"Removed Duplicates1" = Table.Distinct(#"Removed Other Columns"),
    #"Added Custom1" = Table.AddColumn(#"Removed Duplicates1", "Custom", each #"Report Date"),
    #"Expanded Custom" = Table.ExpandTableColumn(#"Added Custom1", "Custom", {"Report Date"}, {"Report Date"}),

[HotChilli]

Don't know what TableA (does it already have unique dates?)  looks like but  this should work

In Table B, Add a custom column with the code 

TableA[thedatecolumn]

[Timaru_Golf]

Yes Table A is just a single column of unique dates.

So it how I add this as a new column - my code looks like this -- having a problem with what I would put in the last line 

 // Create Unique DATE column
    #"Removed Other Columns1" = Table.SelectColumns(#"Remove KEY",{"Report Date"}),
    #"Report Date" = Table.Distinct(#"Removed Other Columns1"),

// Create Fact table expanded by Dates
    #"Removed Other Columns" = Table.SelectColumns(#"Remove KEY",{"COUNTRY", "CustomerName", "CustomerNumber", "Class"}),
    #"Removed Duplicates1" = Table.Distinct(#"Removed Other Columns"),
    #"Added Custom" = Table.AddColumn(XXXXXXX),

Thanks