Add a field to a table in a RelDataModel
Arguments
- x
- tableName
the name of the table to modify (a single character)
- name
the name of the field to add (a single character)
- type
the type of the field (a single character)
- nullable
if the field is nullable (a single logical)
- unique
if the values are unique (a single logical)
- comment
a description (a single character)