SELECT子句中的目标列可以是表中的属性列,也可以是表达式()
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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
The history of higher education in China can be traced back to the_____Dynasty about 2,000 years ago. It established Taixue as the highest educational institute to cultivate senior scholars to help administer national affairs.
A. Han
B. Tang