Cast a column containing NaN as numerical

sql - PostgreSQL - Cast generated column type column casting column of Avey drilling machines Two of the surfaces to be machined are casting at a time makes it a more economical proposition to perform this column casting Transfer of Load at the Base of Column Nominal Reinforcement

column casting Example: To create column C = A + B, I need A and B to be of a numerical type (I know I could do it with sql CAST, but I want it to