Do you need to change the values in a generic way (i.e.: add a fixed value, replace with a fixed value, etc.)?

Do you need to change the values in a generic way related to another column (i.e.: add value from column B to column A, depending on value in column B change value of column A to X else to Y, etc.)?

Do you need to change the values according to user/application input and these input is completely random?

If possible, provide some real world sample data and include the values before and after the update.