Subtract the 3 dates from different tables

[game1]

I have Table2[dateBefore], Table1[dateBegin] and Table1[dateEnd].

So, I need to subtract the 3 dates, so I can have the result in DAYS:  so something like Table2[dateBefore] - Table1[dateEnd] - Table1[dateBegin] 

So, I create a new coloumn call DatesDiff = DATEDIFF(Table2[dateBefore], Table1[dateBegin], DAY) + DATEDIFF(Table2[dateBefore], Table1[dateEnd], DAY)

But the new coloumn call DatesDiff is create in Table1, so I can have acces to Table2[dateBefore].

How can I do if I want to subtract column from differents tables?  I need to have an ID common to the 2 tables to do that?

Can I do that using join?

Please, give complete answer.

[v-weiyan1-msft · Accepted solution]

Hi @game1 ,

According to your description, you can use the SELECTEDVALUE () function to realize that you want to subtract columns from different tables,
Here is an example:
My Sample:
Table1:

Table2:

The formula is as follows.

DatesDiff =
DATEDIFF ( SELECTEDVALUE ( Table2[dateBefore] ), Table1[dateBegin], DAY )
    + DATEDIFF ( SELECTEDVALUE ( Table2[dateBefore] ), Table1[dateEnd], DAY )

Result is as below.

Best Regards,
Yulia Yan

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

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