How and where to set UUID for a column in Application

Applications
#1

Using SC 9, Postgres 11
New to SC
Got three fields in a table

  1. Code Character Varying 32 - PrimaryKey
  2. Number Numeric
  3. Name Character varying 50

Need to store UUID in the field Code, No need to get any input from user.
How to do it ? Any help is really appreciated.

Thanks