add_field

Description:

public abstract void add_field (string field, string? table_ref, string? alias = null)

Add a field at the given table to the SELECT command.

If table is given and it is not already in tables, it is added automatically. If not table is given, the field is added in the hope it will be referenced as a table, but checked by the connection at execution time.

If the field was already added, a new request is ignored.