请在SQL Server 2000中创建题目中的三个表，用SQL语句实现。
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【简答】
请在SQL Server 2000中创建上课数据DB_XK，用SQL语句实现。
请在SQL Server 2000中创建题目中的三个表，用SQL语句实现。
题目
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考点：数据表的定义
本题考查用SQL语言创建数据表。创建数据库的SQL语句格式是：CREATE DATABASE [数据库名]；创建数据表的SQL语句格式是：CREATE TABLE [数据库名. [所有者. ] ]<表名> (<列名><数据类型>[[DAFAULT 初值] | [ IDENTITY[(初值，增量) ] ] ] [ROWGUIDCOL] [NULL | NOT NULL] [PRIMARY KEY | UNIQUE] [, ...]) [CHECK (逻辑表达式)]
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