PRIMARY KEY « Table « MySQL Tutorial

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