ALTER DATABASE

Alter database is a SQL command used to modify the structure of an existing database. This command enables database administrators to make changes to the database schema, such as adding or dropping tables, modifying table columns, or changing database settings. The syntax for the ALTER DATABASE command varies depending on the database management system being used, but the basic principle remains the same. This command should be used with caution as it can have a significant impact on the database and its underlying data. It is recommended to take a backup of the database before making any changes using the ALTER DATABASE command.

相关问题

alter database open

"alter database open" 的意思是打开数据库。这是一条 SQL 命令，用于在 Oracle 数据库中打开一个已经关闭的数据库。执行该命令后，数据库将进入可用状态，用户可以对其进行操作。

alter database修改数据库

"ALTER DATABASE" 是 SQL 语言中的一个命令，用于修改数据库的结构或属性。例如，可以使用该命令修改数据库的名称、设置数据库的默认字符集或编码方式等。

示例:

ALTER DATABASE mydb
  SET default_character_set = utf8;