Return value based on Date / Key pair

[patrick3]

Hi all,

I've got 2 tables:

Date	Unique Key	Value
01/01/2019	abc123	5
01/02/2019	abc123	10
01/01/2019	abc456	5
01/02/2019	abc456	10

Date	Unique Key	Value
05/01/2019	abc123	5
05/02/2019	abc123	10
10/02/2019	abc123	10
15/02/2019	abc456	5

In the 2nd table, it'd like to return the value of the 1st table, based on the newest matching date.
So for "abc123", any date between 01/01/2019 & 31/01/2019 (the day before the next date in table 1) it should return 5.

Hope that makes sense,

Patrick

[az38]

hi @patrick3 

why for abc456 in table 2 returns 5, not 10 (newest in table 1 that older then abc456)?

do not hesitate to give a kudo to useful posts and mark solutions as solution

[patrick3]

Ah you're right of course, just a typo on my end

[az38]

@patrick3 

try a measure in table2

Value = 
var _maxDate = CALCULATE(MAX('Table1'[Date]);FILTER(ALL(Table1);Table1[Unique Key]=SELECTEDVALUE(Table2[Unique Key]) && Table1[Date]<SELECTEDVALUE(Table2[Date])))
RETURN
calculate(MAX('Table1'[Value]);FILTER(ALL(Table1);Table1[Date]=_maxDate && Table1[Unique Key]=SELECTEDVALUE(Table2[Unique Key])))

do not hesitate to give a kudo to useful posts and mark solutions as solution

[patrick3]

I found the solution - at least it looks like it's working 🙂

Using 2 different dax formulas - first one to get the correct date, then one to use that date in a LOOKUPVALUE to get the correct cost price. 

Appreciate your help.

[patrick3]

No, that doesn't seem to work - could it be because my table 1 could have more than 2 dates? I think the max is about 10, but that only keeps growing.