题目内容

不是所有的视图都可以进行更新,但视图都可以进行插入。()

A. 对
B. 错

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SELECT子句中的目标列可以是表中的属性列,也可以是表达式()

A. 对
B. 错

在SQL语句中表达某个属性X为空,可以使用WHERE X=NULL。()

A. 对
B. 错

SQL语句中逻辑运算AND和OR的优先级是一样。()

A. 对
B. 错

Before1905, there were two kinds of schools in China:_____,run by scholars teaching students at home, and official institutions which were open to children of nobles.

A. public school
B. private school