SQLite insert select result multiple times - sqlite

Question

I have a database with three tables 'contacts', 'names', and 'contact_names'.
create table contacts(id integer, gid integer, sid integer);
create table names(id integer primary key, name text);
create table contact_names(fullname text);
insert into names(name) values ('Eberhard');
insert into names(name) values ('Esche');
insert into contacts values(1, (select id from names where name='Eberhard'), (select id from names where name='Esche'));
Now I want to insert the pair 'given name+surname' twice, once as 'given name+surname' and once as 'surname+given name'. What I currently have is a statment like this to generate these names:
SELECT gTable.name || ' ' || sTable.name AS name1, sTable.name || ' ' || gTable.name AS name2 FROM
(
SELECT name FROM names WHERE id=2
) AS gTable,
(
SELECT name FROM names WHERE id=1
) AS sTable;
What I am not able to perform is to insert these names now to table 'contact_names' using something like this:
INSERT INTO contact_names VALUES (name1), (name2) WITH
SELECT gTable.name || ' ' || sTable.name AS name1, sTable.name || ' ' || gTable.name AS name2 FROM
(
SELECT name FROM names WHERE id=2
) AS gTable,
(
SELECT name FROM names WHERE id=1
) AS sTable;
As result table 'contact_names' shall contain the two entries (rows) "Esche Eberhard" and "Eberhard Esche". Does anyone have a clue how to achieve this? Of course I could do the select statement twice, but I would prefer to do this with one select.
BR, Udo
PS: Maybe it is useful to explain why I want to do that. The INSERT statement for 'contact_names' shall be performed by a trigger that is called on removal of entries from 'contacts'. If I remove a row for instance with
DELETE FROM contacts WHERE id=1;
then the two name combination of that contact shall be inserted into 'contact_names' (for further handling of these names). The table will be cleared regularily after handling the removed names.

Answer 1

You have one row with two columns, but you want two rows with one column.
In the general case, this can be done with a common table expression and a compound query:
WITH TwoColumns(a, b) AS (
SELECT a, b FROM ... -- the original two-column query
)
INSERT INTO ...(x)
SELECT a FROM TwoColumns
UNION ALL
SELECT b FROM TwoColumns;
In this case, we don't need so many subqueries and can simplify a little:
WITH gs(gName, sName) AS (
SELECT g.name,
s.name
FROM names AS g,
names AS s
WHERE g.id = 2
AND s.id = 1
)
INSERT INTO contact_names(fullname)
SELECT gName || ' ' || sName FROM gs
UNION ALL
SELECT sName || ' ' || gName FROM gs;