CROSS JOIN : ANSI 92 Join « Table Join « MySQL Tutorial





A CROSS JOIN returns all the records from all the tables mentioned in the JOIN.

This is also referred to as a Cartesian join.

The syntax for a CROSS JOIN would look like the following:

mysql>
mysql>
mysql> CREATE TABLE Employee(
    ->     id            int,
    ->     first_name    VARCHAR(15),
    ->     last_name     VARCHAR(15),
    ->     start_date    DATE,
    ->     end_date      DATE,
    ->     salary        FLOAT(8,2),
    ->     city          VARCHAR(10),
    ->     description   VARCHAR(15)
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql>
mysql> create table job (
    ->   id         int,
    ->   title      VARCHAR(20)
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->              values (1,'Jason',    'Martin',  '19960725',  '20060725', 1234.56, 'Toronto',  'Programmer');
Query OK, 1 row affected (0.01 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(2,'Alison',   'Mathews',  '19760321', '19860221', 6661.78, 'Vancouver','Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(3,'James',    'Smith',    '19781212', '19900315', 6544.78, 'Vancouver','Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(4,'Celia',    'Rice',     '19821024', '19990421', 2344.78, 'Vancouver','Manager');
Query OK, 1 row affected (0.01 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(5,'Robert',   'Black',    '19840115', '19980808', 2334.78, 'Vancouver','Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(6,'Linda',    'Green',    '19870730', '19960104', 4322.78,'New York',  'Tester');
Query OK, 1 row affected (0.02 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(7,'David',    'Larry',    '19901231', '19980212', 7897.78,'New York',  'Manager');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into Employee(id,first_name, last_name, start_date, end_Date,   salary,  City,       Description)
    ->               values(8,'James',    'Cat',     '19960917',  '20020415', 1232.78,'Vancouver', 'Tester');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> insert into job (id, title) values (1,'Tester');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (2,'Accountant');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (3,'Developer');
Query OK, 1 row affected (0.02 sec)

mysql> insert into job (id, title) values (4,'Coder');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (5,'Director');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (6,'Mediator');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (7,'Proffessor');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (8,'Programmer');
Query OK, 1 row affected (0.00 sec)

mysql> insert into job (id, title) values (9,'Developer');
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> select * from job;
+------+------------+
| id   | title      |
+------+------------+
|    1 | Tester     |
|    2 | Accountant |
|    3 | Developer  |
|    4 | Coder      |
|    5 | Director   |
|    6 | Mediator   |
|    7 | Proffessor |
|    8 | Programmer |
|    9 | Developer  |
+------+------------+
9 rows in set (0.02 sec)

mysql> select * from Employee;
+------+------------+-----------+------------+------------+---------+-----------+-------------+
| id   | first_name | last_name | start_date | end_date   | salary  | city      | description |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
|    1 | Jason      | Martin    | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto   | Programmer  |
|    2 | Alison     | Mathews   | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester      |
|    3 | James      | Smith     | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester      |
|    4 | Celia      | Rice      | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager     |
|    5 | Robert     | Black     | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester      |
|    6 | Linda      | Green     | 1987-07-30 | 1996-01-04 | 4322.78 | New York  | Tester      |
|    7 | David      | Larry     | 1990-12-31 | 1998-02-12 | 7897.78 | New York  | Manager     |
|    8 | James      | Cat       | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester      |
+------+------------+-----------+------------+------------+---------+-----------+-------------+
8 rows in set (0.00 sec)

mysql>
mysql>
The old way:
mysql>
mysql> SELECT C.First_Name, C.Last_Name, O.title
    -> FROM Employee as C, job as O;
+------------+-----------+------------+
| First_Name | Last_Name | title      |
+------------+-----------+------------+
| Jason      | Martin    | Tester     |
| Alison     | Mathews   | Tester     |
| James      | Smith     | Tester     |
| Celia      | Rice      | Tester     |
| Robert     | Black     | Tester     |
| Linda      | Green     | Tester     |
| David      | Larry     | Tester     |
| James      | Cat       | Tester     |
| Jason      | Martin    | Accountant |
| Alison     | Mathews   | Accountant |
| James      | Smith     | Accountant |
| Celia      | Rice      | Accountant |
| Robert     | Black     | Accountant |
| Linda      | Green     | Accountant |
| David      | Larry     | Accountant |
| James      | Cat       | Accountant |
| Jason      | Martin    | Developer  |
| Alison     | Mathews   | Developer  |
| James      | Smith     | Developer  |
| Celia      | Rice      | Developer  |
| Robert     | Black     | Developer  |
| Linda      | Green     | Developer  |
| David      | Larry     | Developer  |
| James      | Cat       | Developer  |
| Jason      | Martin    | Coder      |
| Alison     | Mathews   | Coder      |
| James      | Smith     | Coder      |
| Celia      | Rice      | Coder      |
| Robert     | Black     | Coder      |
| Linda      | Green     | Coder      |
| David      | Larry     | Coder      |
| James      | Cat       | Coder      |
| Jason      | Martin    | Director   |
| Alison     | Mathews   | Director   |
| James      | Smith     | Director   |
| Celia      | Rice      | Director   |
| Robert     | Black     | Director   |
| Linda      | Green     | Director   |
| David      | Larry     | Director   |
| James      | Cat       | Director   |
| Jason      | Martin    | Mediator   |
| Alison     | Mathews   | Mediator   |
| James      | Smith     | Mediator   |
| Celia      | Rice      | Mediator   |
| Robert     | Black     | Mediator   |
| Linda      | Green     | Mediator   |
| David      | Larry     | Mediator   |
| James      | Cat       | Mediator   |
| Jason      | Martin    | Proffessor |
| Alison     | Mathews   | Proffessor |
| James      | Smith     | Proffessor |
| Celia      | Rice      | Proffessor |
| Robert     | Black     | Proffessor |
| Linda      | Green     | Proffessor |
| David      | Larry     | Proffessor |
| James      | Cat       | Proffessor |
| Jason      | Martin    | Programmer |
| Alison     | Mathews   | Programmer |
| James      | Smith     | Programmer |
| Celia      | Rice      | Programmer |
| Robert     | Black     | Programmer |
| Linda      | Green     | Programmer |
| David      | Larry     | Programmer |
| James      | Cat       | Programmer |
| Jason      | Martin    | Developer  |
| Alison     | Mathews   | Developer  |
| James      | Smith     | Developer  |
| Celia      | Rice      | Developer  |
| Robert     | Black     | Developer  |
| Linda      | Green     | Developer  |
| David      | Larry     | Developer  |
| James      | Cat       | Developer  |
+------------+-----------+------------+
72 rows in set (0.00 sec)

mysql>
The ANSI-92 way:
mysql>
mysql> SELECT C.First_Name, C.Last_Name, O.title
    -> FROM Employee as C
    -> CROSS JOIN Job as O;
+------------+-----------+------------+
| First_Name | Last_Name | title      |
+------------+-----------+------------+
| Jason      | Martin    | Tester     |
| Alison     | Mathews   | Tester     |
| James      | Smith     | Tester     |
| Celia      | Rice      | Tester     |
| Robert     | Black     | Tester     |
| Linda      | Green     | Tester     |
| David      | Larry     | Tester     |
| James      | Cat       | Tester     |
| Jason      | Martin    | Accountant |
| Alison     | Mathews   | Accountant |
| James      | Smith     | Accountant |
| Celia      | Rice      | Accountant |
| Robert     | Black     | Accountant |
| Linda      | Green     | Accountant |
| David      | Larry     | Accountant |
| James      | Cat       | Accountant |
| Jason      | Martin    | Developer  |
| Alison     | Mathews   | Developer  |
| James      | Smith     | Developer  |
| Celia      | Rice      | Developer  |
| Robert     | Black     | Developer  |
| Linda      | Green     | Developer  |
| David      | Larry     | Developer  |
| James      | Cat       | Developer  |
| Jason      | Martin    | Coder      |
| Alison     | Mathews   | Coder      |
| James      | Smith     | Coder      |
| Celia      | Rice      | Coder      |
| Robert     | Black     | Coder      |
| Linda      | Green     | Coder      |
| David      | Larry     | Coder      |
| James      | Cat       | Coder      |
| Jason      | Martin    | Director   |
| Alison     | Mathews   | Director   |
| James      | Smith     | Director   |
| Celia      | Rice      | Director   |
| Robert     | Black     | Director   |
| Linda      | Green     | Director   |
| David      | Larry     | Director   |
| James      | Cat       | Director   |
| Jason      | Martin    | Mediator   |
| Alison     | Mathews   | Mediator   |
| James      | Smith     | Mediator   |
| Celia      | Rice      | Mediator   |
| Robert     | Black     | Mediator   |
| Linda      | Green     | Mediator   |
| David      | Larry     | Mediator   |
| James      | Cat       | Mediator   |
| Jason      | Martin    | Proffessor |
| Alison     | Mathews   | Proffessor |
| James      | Smith     | Proffessor |
| Celia      | Rice      | Proffessor |
| Robert     | Black     | Proffessor |
| Linda      | Green     | Proffessor |
| David      | Larry     | Proffessor |
| James      | Cat       | Proffessor |
| Jason      | Martin    | Programmer |
| Alison     | Mathews   | Programmer |
| James      | Smith     | Programmer |
| Celia      | Rice      | Programmer |
| Robert     | Black     | Programmer |
| Linda      | Green     | Programmer |
| David      | Larry     | Programmer |
| James      | Cat       | Programmer |
| Jason      | Martin    | Developer  |
| Alison     | Mathews   | Developer  |
| James      | Smith     | Developer  |
| Celia      | Rice      | Developer  |
| Robert     | Black     | Developer  |
| Linda      | Green     | Developer  |
| David      | Larry     | Developer  |
| James      | Cat       | Developer  |
+------------+-----------+------------+
72 rows in set (0.00 sec)

mysql>
mysql>
mysql>
mysql>
mysql> drop table job;
Query OK, 0 rows affected (0.00 sec)

mysql> drop table Employee;
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql>










5.9.ANSI 92 Join
5.9.1.The basic format of the ANSI-92 JOIN
5.9.2.CROSS JOIN
5.9.3.INNER JOIN
5.9.4.LEFT JOIN