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<>SQL语句创建数据库
SQL语句如下：
create database 数据库名称 on ( name=数据文件逻辑名称, filename='路径+数据文件名', size=数据文件初始大小,
maxsize=数据文件最大容量, filegrowth=数据文件自动增长容量 ) log on ( name=日志文件逻辑名称, filename=
'路径+日志文件名', size=日志文件初始大小, maxsize= 日志文件最大容量, filegrowth=日志文件自动增长容量 )
（1） name: 数据文件名称一般为 (name) _Data ，日志文件名称一般为（name）_Log 。
（2） filename： 数据文件名后缀为 .mdf ，日志文件名后缀为 .ldf 。
（3） maxsize: 设置为 unlimited 时，表示文件最大大小无限制。
（4） filegrowth: 可以设置为具体值（—M）或者百分比（—%），设置为 unlimited 时，表示文件无限制增长。
（5） 某些属性不设置时，创建数据库时会按默认值创建，例如，如果只用 “ create database 数据库名称 ” 创建数据库时，DBMS会按照默认的
“逻辑名称” ”文件组“ ”初始大小“ ”自动增长“ 和 “路径” 等属性创建数据库。
<>例题
创建一个名为“SM”的数据库，初始大小为10MB，最大为50MB，数据库自动增长，增长方式按10%；日志文件初始大小为2MB，最大大小不受限制，按1MB增长。
create database SM on ( name=SM_Data, filename='D:\SM.mdf', size=10, maxsize=50
, filegrowth=10% ) log on ( name=SM_Log, filename='D:\SM.ldf', size=2, maxsize=
unlimited, filegrowth=1MB )
