【单选题】顺序执行下列命令后,屏幕最后显示的结果是______。SELECT1USEABCSELECT2USEEFD?SELECT()
【判断题】Because heuristics simplify the decision-making process, they are unlikely to lead to errors.
【简答题】select '1+2' ;结果是( )
【简答题】A.Because it's safer. B.Because it's cheaper. C.Because it's faster. D.Because it's earlier.
【简答题】执行 语句 SELECT “1+2”;的结果是( )。
【单选题】分析语句: create table t1 as select * from regions where 1=2; 结果是什么?
C.
会创建表t1,但不会插入行,因为条件为False
D.
会创建表t1,并插入regions表中的所有行
【简答题】语句SELECT “1+2”;的显示结果是 。
【单选题】select year('2020-3-1')/2的结果是