Insert on 3 joins MYSQL - mysql

Question

What I am trying to do is to insert records from multiple tables into 1 table by joining. Here is what I have and I can't seem to get it to work. I get the following error #1136 - Column count doesn't match value count at row 1
INSERT INTO users(`name`, `email`,`location_id`, `department_id`)
VALUES('John Doe', 'jdoe#email.com', 1, 1)
INSERT INTO extensions(`ext`)
VALUES(98765)
INSERT INTO dids(`did`)
VALUES('1-800-555-5555')
INSERT INTO users_numbers(user_id,ext_id,did_id)
SELECT extensions.*, dids.*, users.*
FROM extensions tbl_ext, dids tbl_dids, users tbl_users, users_numbers usn
Inner Join users ON users.id=usn.user_id
Inner Join extensions ON extensions.id=usn.ext_id
Inner Join dids ON dids.id=usn.did_id
WHERE tbl_users.name = 'John Doe'
AND tbl_users.email = 'jdoe#email.com'
AND tbl_ext.ext = 98765
AND tbl_dids.did='401-559-9999';
The first 3 insert statements work. The error fires on the 4 insert when I try to join. Can anyone help.

Answer 1

Use LAST_INSERT_ID():
INSERT INTO users(`name`, `email`,`location_id`, `department_id`)
VALUES('John Doe', 'jdoe#email.com', 1, 1);
SET #user_id = LAST_INSERT_ID();
INSERT INTO extensions(`ext`)
VALUES(98765);
SET #ext_id = LAST_INSERT_ID();
INSERT INTO dids(`did`)
VALUES('1-800-555-5555');
SET #did_id = LAST_INSERT_ID();
INSERT INTO users_numbers(user_id,ext_id,did_id)
VALUES (#user_id,#ext_id,#did_id);
Instead of using user variables (#user_id,#ext_id,#did_id) you can also fetch the LAST_INSERT_ID in your application language.

Answer 2

There are two problems.
First, the SELECT list has to return only the columns that you want to insert into the table. The error is because you're returning tablename.* rather than specific columns.
Second, the SELECT query is very wrong. You have the tables that you're joining listed twice: first in the FROM clause and then again in the INNER JOIN clauses. You should only list them once (unless you're doing a self-JOIN, which is not needed here).
And you shouldn't be joining with users_numbers -- that's the table you're trying to add to, so it doesn't have the IDs for these rows yet.
What you want is a simple cross join between the rows from each of the source tables that match the values you're combining into the relation table.
INSERT INTO users_numbers(user_id,ext_id,did_id)
SELECT u.id, e.id, d.id
FROM users AS u
CROSS JOIN extensions AS e
CROSS JOIN dids AS d
WHERE u.name = 'John Doe'
AND u.email = 'jdoe#email.com'
AND e.ext = 98765
AND d.did='401-559-9999';

Answer 3

You need to be very specific about which columns you want from that SELECT. Right now you're grabbing everything from the three tables, that's too much.
Maybe you mean:
INSERT INTO users_numbers(user_id,ext_id,did_id)
SELECT users.id, extensions.id, dids.id
FROM ...
When composing complicated queries like this, run the SELECT subcomponent separately to ensure it produces the right data. I bet if you ran your version it'd show a bunch of columns.