Often we want to compute values that are based on an existing row. Not only do we want to compute them once, but we actually want to add them as a separate column that will keep the values up to date with the row values. This is called a "Computed Column".
For example, if we have a table that looks like this:
If we want to add a fourth column that will add the first two values, we would end up with this:
To accomplish this, we would call:
Note: Computed columns update on "add", "remove" and "change" events regardless of whether the
sync property was set.