code: def get_sync_sql(self, field_name, missing_langs, model):
          
          qn = connection.ops.quote_name
          style = no_style()
          sql_output = []
          db_table = model._meta.db_table
          for lang in missing_langs:
              new_field = build_localized_fieldname(field_name, lang)
              f = model._meta.get_field(new_field)
              col_type = f.db_type(connection=connection)
              field_sql = [style.SQL_FIELD(qn(f.column)), style.SQL_COLTYPE(col_type)]
              # column creation
              stmt = "ALTER TABLE %s ADD COLUMN %s" % (qn(db_table), ' '.join(field_sql))
              if not f.null:
                  stmt += " " + style.SQL_KEYWORD('NOT NULL')
              sql_output.append(stmt + ";")
          return sql_output
docs: Returns SQL needed for sync schema for a new translatable field.