问题
单项选择题
以下关于“视图”的正确描述是( )。
A．视图独立于表文件
B．视图不可更新
C．视图只能从一个表派生出来
D．视图可以删除
答案
参考答案：D
解析： 视图可以用来从一个或多个相关联的表中提取(更新)有用的信息，视图依赖于表，不独立存在。通过视图既可以查询表，又可以更新表。视图可以删除。
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以下关于“视图”的正确描述是( )。
A．视图独立于表文件
B．视图不可更新
C．视图只能从一个表派生出来
D．视图可以删除
参考答案：D
解析： 视图可以用来从一个或多个相关联的表中提取(更新)有用的信息，视图依赖于表，不独立存在。通过视图既可以查询表，又可以更新表。视图可以删除。
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| Bill Clinton took office (就职) 1 January20, 1993 and became the 42nd US president (总统). He was the first US president 2 was born after World War n. He was 3 0ne of the youngest of all US presidents, Clinton was born 4 a poor family. Three months before he was born, his father, William Blats, 5 When he was small, his mother remarried (再婚) Norger Clinton, 6 the boy's family name was changed. In the summer of 1963, Clinton was asked to visit the 7 of Washington. 8 his visit, he 9 President Kennedy in the White House. At that time, he wanted to become a president. And some years 10 his dream came true! |