Alter table to add the foreign key : Alter Table « Table « MySQL Tutorial

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MySQL Tutorial » Table » Alter Table 
4. 3. 4. Alter table to add the foreign key
mysql>
mysql>
mysql>
mysql> CREATE TABLE Publishers
    -> (
    ->    PubID SMALLINT NOT NULL DEFAULT 1
    -> )
    -> ENGINE=INNODB;
Query OK, rows affected (0.05 sec)

mysql>
mysql>
mysql> CREATE TABLE Books
    -> (
    ->    BookID SMALLINT NOT NULL,
    ->    BookName VARCHAR(40NOT NULL,
    ->    PubID SMALLINT NOT NULL DEFAULT 1
    -> )
    -> ENGINE=INNODB;
Query OK, rows affected (0.05 sec)

mysql>
mysql>
mysql> ALTER TABLE Books
    -> ADD PRIMARY KEY (BookID),
    -> ADD CONSTRAINT fk_1 FOREIGN KEY (PubIDREFERENCES Publishers (PubID),
    -> ADD COLUMN Format ENUM('paperback', 'hardcover') NOT NULL AFTER BookName;
mysql>
mysql> desc Books;
+----------+-------------+------+-----+---------+-------+
| Field    | Type        | Null | Key | Default | Extra |
+----------+-------------+------+-----+---------+-------+
| BookID   | smallint(6| NO   |     |         |       |
| BookName | varchar(40| NO   |     |         |       |
| PubID    | smallint(6| NO   |     | 1       |       |
+----------+-------------+------+-----+---------+-------+
rows in set (0.00 sec)

mysql>
mysql> desc Publishers;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| PubID | smallint(6| NO   |     | 1       |       |
+-------+-------------+------+-----+---------+-------+
row in set (0.02 sec)

mysql>
mysql> drop table Books;
Query OK, rows affected (0.02 sec)

mysql>
mysql> drop table Publishers;
Query OK, rows affected (0.05 sec)

mysql>
4. 3. Alter Table
4. 3. 1. ALTER [IGNORE] TABLE table_name specification [,specification]
4. 3. 2. Add primary key to a table by using the alter table command
4. 3. 3. Drop table column with alter table command
4. 3. 4. Alter table to add the foreign key
4. 3. 5. Drop primary key from a table using the alter table command
4. 3. 6. MODIFYing a TABLE
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