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ALTER DATABASE db_name alter_specification [, alter_specification] .... alter_specification: [DEFAULT] CHARACTER SET charset_name | [DEFAULT] COLLATE collation_name
ALTER DATABASE allows you to change the overall characteristics of a database.
The CHARACTER SET clause changes the database character set. The COLLATE clause changes the database collation.
Database characteristics are stored in the db.opt file in the database directory.
To use ALTER DATABASE, you need the ALTER privilege on the database.
ALTER DATABASE was added in MySQL 4.1.1.