DAX not pulling up field in new measure

[matsahiro]

Hello, I'm fairly new to DAX. I'm trying to create this new measure comparing previous and old dates. DAX editor isn't pulling up the fields needed to compute though. 

New_date_indicator = IF(Table1[Date1]=Table2[Date2], "0", "1")

Any explanation to why intellisense isn't pulling up these fields to calculate? Thank you. 

This is what I'd like to create

Dummy data

Date1	Date2	Shop	New_date_indicator
2/1/2019	2/1/2019	TX	0
3/4/2018	6/7/2020	FL	1
4/5/2020	4/5/2020	CA	0
3/2/2021	3/2/2021	WA	1

[MattAllington]

There is a lot to learn. Table1[Date1] (and 2) are columns. Because they are columns, they can have multiple values in those columns. It's like me saying "is this column of 10 values greater than this other column of 10 values". You can't do this, and hence Intellisense won't offer it as an option. To do the calculation, you must find a single value in the first column and compare it to a single value in the second column, like this. 

New_date_indicator = IF(SELECTEDVALUE(Table1[Date1])=SELECTEDVALUE(Table2[Date2]), "0", "1")

[matsahiro]

@MattAllington Great! Thank you so much for your help. I believe that should work for me. The error that I recieve though is "there's not enough memory to complete this operation", when this should only calculate for about 12 rows. The selectedvalues on their own calculate just fine, it only throws an error when it is all pieced together in the IF statement. Any thoughts?