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【单选题】
下面关于 SQL 语言的叙述中,哪一条是错误的( )。A.
SQL 既可作为联机交互环境中的查询语言又可嵌入宿主语言中
B.
使用 SQL 用户只能定义索引而不能引用索引
C.
SQL 没有数据控制功能
D.
使用 SQL 用户可以定义和检索视图
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