You can add a new query to a query specification by using the ADD QUERY clause of the ALTER VIEW statement. 1 is assigned to the query defined when a virtual table was created, and 2 is assigned to the query added by the ADD QUERY clause.
ALTER [ VIEW | VCLASS ] view_name
ADD QUERY select_statement
[ INHERIT resolution [ {, resolution }_ ] ]
resolution :
{ column_name | method_name } OF superclass_name [ AS alias ]
SELECT * FROM b_view;
id phone
===================================
1 '111-1111'
2 '222-2222'
3 '333-3333'
4 NULL
5 NULL
ALTER VIEW b_view ADD QUERY SELECT * FROM a_tbl WHERE id IN (1,2);
SELECT * FROM b_view;
id phone
===================================
1 '111-1111'
2 '222-2222'
3 '333-3333'
4 NULL
5 NULL
1 '111-1111'
2 '222-2222'