
table
Column1 Column2 Column3 Column4
Lunes 1 2 4
martes 2 4 2
miercoles 1 1 1
Query
select column1 where (column2+column3)<column4
1+2 =3 4
2+4=6 2
1+1=2 1
results Lunes
That query only have to select monday because is the one where (column2+column3)<column4