How to alter precision of numeric field?

Is it possible to change it using command like this:

ALTER TABLE table ALTER COLUMN numcol TYPE NUMBERIC(12,2) ?
CRDB gives errors

Hello Alexander!
At this time CockroachDB does not yet allow to change a column’s type.
We have work ongoing to add some support for this feature in CockroachDB 2.1.

In the meantime, the recommended way to do this is to create a new column with the new type, copy the data from the existing column to the new column, then delete the old column.