If the value from first column is missing in the second column the show value from column 1

TcT85 

sample data : 

output 

measure

Measure 13 = 
var ds = 
EXCEPT(
    values(tbl_1[col1]),values(tbl_2[col2])
)
return
CALCULATE(
    COUNTROWS(tbl_1),
    KEEPFILTERS(ds)
    )

if you dont want to use a measure . you can simply refer to the below  method : 

output

Measure 13 = 
var ds = 
EXCEPT(
    values(tbl_1[col1]),values(tbl_2[col2])
)
var c = 
CALCULATE(
    COUNTROWS(tbl_1),
    KEEPFILTERS(ds)
    )


return if(ISBLANK(c), 0,1)

let me know if it works for you . 

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