I have two columns - Column1 containing repetitive values for e.g, (1,1,1,2,4,4,4,4,5,5) and column2 contains unique values(1,2,3,4,5). I have to identify the elements which are not present in the column1.
In this I have to get output - 3.
I tried so many times but couldn’t able to find the solution.
can anyone help me in this.