MySQL - Find listings posted by multiple people - mysql

Question

I have a schema as follows;
CREATE TABLE `vehicle` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`vehiclelicence` varchar(50) DEFAULT NULL,
`userid` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) DEFAULT NULL,
`companyid` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE `company` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
);
insert into vehicle (vehiclelicence, userid) values ('PB1234', 1);
insert into vehicle (vehiclelicence, userid) values ('AB0987', 2);
insert into vehicle (vehiclelicence, userid) values ('UI7654', 3);
insert into vehicle (vehiclelicence, userid) values ('DV8888', 4);
insert into vehicle (vehiclelicence, userid) values ('PB1234', 2);
insert into vehicle (vehiclelicence, userid) values ('UI7654', 1);
insert into user (username, companyid) values ('Bob', 1);
insert into user (username, companyid) values ('Tim', 2);
insert into user (username, companyid) values ('Jim', 3);
insert into user (username, companyid) values ('Fred', 4);
insert into company (name) values ('Company 1');
insert into company (name) values ('Company 2');
insert into company (name) values ('Company 3');
insert into company (name) values ('Company 4');
Users add vehiclelicences all the time.
How can I return all vehiclelicences listed by more than one company and which company listed it?
This is the sql I have so far, but it lists all the records.
SELECT *
FROM vehicle v1
join user u on u.id = v1.userid
join company c on c.id = u.companyid
WHERE EXISTS
(
SELECT 1
FROM vehicle v2
WHERE v1.vehiclelicence = v1.vehiclelicence and v2.userid != v1.userid
LIMIT 1, 1
)
order by v1.vehiclelicence
;
I have created a Fiddle
This is the desired output
+----------------+--------+----------+-----------+-------------+
| vehiclelicence | userid | username | companyid | companyname |
+----------------+--------+----------+-----------+-------------+
| PB1234 | 1 | Bob | 1 | Company 1 |
| PB1234 | 2 | Tim | 2 | Company 2 |
| UI7654 | 3 | Jim | 3 | Company 3 |
| UI7654 | 1 | Bob | 1 | Company 1 |
+----------------+--------+----------+-----------+-------------+
Thank you.

Answer 1

WHERE v1.vehiclelicence = v1.vehiclelicence - a typo here..and remove the limit and it works.
SELECT *
FROM vehicle v1
join user u on u.id = v1.userid
join company c on c.id = u.companyid
WHERE EXISTS
(
SELECT 1
FROM vehicle v2
WHERE v1.vehiclelicence = v2.vehiclelicence and v2.userid != v1.userid
#LIMIT 1, 1
)
order by v1.vehiclelicence
;
OR start the offset from 0
SELECT *
FROM vehicle v1
join user u on u.id = v1.userid
join company c on c.id = u.companyid
WHERE EXISTS
(
SELECT 1
FROM vehicle v2
WHERE v1.vehiclelicence = v2.vehiclelicence and v2.userid != v1.userid
LIMIT 0, 1
)
order by v1.vehiclelicence
;
either way
+----+----------------+--------+----+----------+-----------+----+-----------+
| id | vehiclelicence | userid | id | username | companyid | id | name |
+----+----------------+--------+----+----------+-----------+----+-----------+
| 1 | PB1234 | 1 | 1 | Bob | 1 | 1 | Company 1 |
| 5 | PB1234 | 2 | 2 | Tim | 2 | 2 | Company 2 |
| 6 | UI7654 | 1 | 1 | Bob | 1 | 1 | Company 1 |
| 3 | UI7654 | 3 | 3 | Jim | 3 | 3 | Company 3 |
+----+----------------+--------+----+----------+-----------+----+-----------+
4 rows in set (0.001 sec)