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

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MySQL Tutorial » Table Join » ANSI 92 Join 
5. 9. 3. INNER JOIN

During an INNER JOIN, all records that are unmatched are discarded.

Only the matched rows are displayed.

This is the default type of join, so the word INNER is optional.

This type of join is based on the criteria in the JOIN clause.

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, rows affected (0.06 sec)

mysql>
mysql> create table job (
    ->   id         int,
    ->   title      VARCHAR(20)
    -> );
Query OK, 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, row affected (0.00 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, 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, 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, row affected (0.00 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, row affected (0.02 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, row affected (0.00 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, 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, row affected (0.00 sec)

mysql>
mysql> insert into job (id, titlevalues (1,'Tester');
Query OK, row affected (0.02 sec)

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

mysql> insert into job (id, titlevalues (3,'Developer');
Query OK, row affected (0.00 sec)

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

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

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

mysql> insert into job (id, titlevalues (7,'Proffessor');
Query OK, row affected (0.02 sec)

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

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

mysql>
mysql> select from job;
+------+------------+
| id   | title      |
+------+------------+
|    | Tester     |
|    | Accountant |
|    | Developer  |
|    | Coder      |
|    | Director   |
|    | Mediator   |
|    | Proffessor |
|    | Programmer |
|    | Developer  |
+------+------------+
rows in set (0.00 sec)

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

mysql>
mysql>
mysql>
mysql> SELECT C.First_Name, C.Last_Name, O.title
    -> FROM employee as C
    -> INNER JOIN job as O ON C.ID = O.ID;
+------------+-----------+------------+
| First_Name | Last_Name | title      |
+------------+-----------+------------+
| Jason      | Martin    | Tester     |
| Alison     | Mathews   | Accountant |
| James      | Smith     | Developer  |
| Celia      | Rice      | Coder      |
| Robert     | Black     | Director   |
| Linda      | Green     | Mediator   |
| David      | Larry     | Proffessor |
| James      | Cat       | Programmer |
+------------+-----------+------------+
rows in set (0.00 sec)

mysql>
The old way to create an INNER JOIN would look like the following:
mysql>
mysql> SELECT C.First_Name, C.Last_Name, O.title
    -> FROM Employee as C, job as O
    -> WHERE C.ID = O.ID;
+------------+-----------+------------+
| First_Name | Last_Name | title      |
+------------+-----------+------------+
| Jason      | Martin    | Tester     |
| Alison     | Mathews   | Accountant |
| James      | Smith     | Developer  |
| Celia      | Rice      | Coder      |
| Robert     | Black     | Director   |
| Linda      | Green     | Mediator   |
| David      | Larry     | Proffessor |
| James      | Cat       | Programmer |
+------------+-----------+------------+
rows in set (0.00 sec)

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

mysql> drop table Employee;
Query OK, 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
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