was stuck on this problem for days........

first thing i learnt is that round() needs a numeric input and integer for dp. i.e round(x,y), x must be numeric and y must be integer.

second thing i learnt is that the rounding changes only apply once converted to float afterwards.. confusing. i.e round(x,y)::float will then show the rounded number as however decimal places.

Question was very confusing, the whole time I though I was suppose to add the column1 and column2,
If odd then..
If even then..
But this wasnt the case lol.

I finally gave in and checked the solution JUST to see how easy it was..
It was literally sum of 1 column is even, then.... if odd then..

oh well you win some you lose some.