Create primary key in column definition : PRIMARY KEY « Table « MySQL Tutorial

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MySQL Tutorial » Table » PRIMARY KEY

4. 15. 2. Create primary key in column definition


mysql>

mysql>

mysql> CREATE TABLE myTable

    -> (

    ->    ID SMALLINT UNSIGNED NOT NULL PRIMARY KEY,

    ->    Description VARCHAR(40)

    -> );

Query OK, 0 rows affected (0.03 sec)



mysql>

mysql> desc myTable;

+-------------+----------------------+------+-----+---------+-------+

| Field       | Type                 | Null | Key | Default | Extra |

+-------------+----------------------+------+-----+---------+-------+

| ID          | smallint(5) unsigned | NO   | PRI |         |       |

| Description | varchar(40)          | YES  |     | NULL    |       |

+-------------+----------------------+------+-----+---------+-------+

2 rows in set (0.00 sec)



mysql>

mysql> drop table myTable;

Query OK, 0 rows affected (0.00 sec)

4. 15. PRIMARY KEY
	4. 15. 1.	Primary Keys
	4. 15. 2.	Create primary key in column definition
	4. 15. 3.	Create primary key after column definition
	4. 15. 4.	Multiple-Column Primary Keys
	4. 15. 5.	Auto_INCREMENT primary key
	4. 15. 6.	Use two columns as the combined primary key
	4. 15. 7.	Use partial indexing as the primary key
	4. 15. 8.	ALTER TABLE table_name ADD PRIMARY KEY index_name (column_name[,...]);
	4. 15. 9.	To drop a PRIMARY KEY
	4. 15. 10.	To remove a primary key
	4. 15. 11.	Alter table to drop primary key and foreign key
	4. 15. 12.	Add Index and primary key to a table in table creation command

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