insert multiple values in mysql in a nested select - mysql

Question

I'm fairly new to sql. This might be basic. I have two tables one with groups and one with members, I want to link them up so that a third table contains id_group and id_member. The value MYGROUP is supplied during the import. I tried this:
insert ignore into member_group (id_group, id_member)
values ( ( select id_group from group where group_name='MYGROUP' ) ,
( select id_member from member ) );
But I end up with one row in member_group containing a null value.
on it's own this yields 1 for example:
select id_group from group where group_name='MYGROUP';
+----------+
| id_group |
+----------+
| 1 |
+----------+
on it's own this yields a list of id_members
mysql> select id_member from member;
+-----------+
| id_member |
+-----------+
| 123 |
| 456 |
| 789 |
I want member_group to then look like this
+-----------+----------+
| id_group |id_member |
+-----------+----------+
| 1 | 123 |
| 1 | 456 |
| 1 | 789 |
How can I do this (without resorting to shell scripts, for loops and sed) ?
As requested,
mysql> select * from group;
+----------+------------------+
| id_group | group_name |
+----------+------------------+
| 1 | vip-member |
| 2 | standard-member |
mysql> select * from member;
+-----------+----------+
| id_member | fullname |
+-----------+----------+
| 123 | Bob |
| 456 | Pete |
Which, if I could get it working, should look like below.
mysql> select * from member_group;
+------------------+----------+-----------+
| id_member_groups | id_group | id_member |
+------------------+----------+-----------+
| 1 | 1 | 123 |
| 2 | 1 | 456 |
| 3 | 1 | 789 |
| 4 | 2 | 123 |
| 5 | 2 | 789 |
id_group is supplied during the import phase. One batch of say 200 members, will be members of the same id_group. I was thinking about adding the group_id to a temporary table. But I'm a tad lost to be honest.

Answer 1

You can do a cross join to achieve your goal.
insert ignore into member_group (id_group, id_member)
select member_group.id_group, member.id_member
from member_group
cross join member
where group_name = 'MYGROUP';