在SQL Server 2000的查询分析器中执行命令：SELECT * FROM STUDENT WHERE XB IS NULL执行结果是（ ）。
企业资源计划的简称是（ ）。
信息系统是人机系统，系统安全的威胁更多来源于（ ）。
（ ）是企业的命脉，很容易成为被攻击和窃取的目标。
数据加密和信息隐藏都是针对（ ）采取的安全技术。
系统维护的目标是（ ）。
题目
简单查询
本题考查查询含有空值NULL的记录。
多做几道
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