Date Time Filter

[dalmn21]

I created a duplicate column (let's call this B) and changed the format to hh:nn of a datetime (mm/dd/yyyy hh:mm:ss) column. I also have a column (let's call this A) whose values are 0 or 1. I want to display, in a table, column A whose value is 1 and column B whose value is less than let's say 12 for any selected date. 

My measure I created.. 

FILTER(Main, (Main[A] = 1 && HOUR(Main[B]) < 12)) but I am getting an error that says,  "The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value."

Thank you in advance! 

[amitchandak]

@dalmn21 , filter returns table you need have measure like

countrows(FILTER(Main, (Main[A] = 1 && HOUR(Main[B]) < 12)) )

or

calculate(count(Main[A]) , FILTER(Main, (Main[A] = 1 && HOUR(Main[B]) < 12)) )