首页/ 题库 / [单选题]在SELECT语句中,使用号表示( )的答案

在SELECT语句中,使用号表示( )

单选题
2021-09-06 21:13
A、选择任何列
B、选择全部列
C、选择全部元组
D、 选择主码
查看答案

正确答案
B

试题解析

相关题目
boost的意思是:help or encourage to increase or improve
eloquent的意思是:fluent or persuasive in speaking or writing

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.

在应用ORS液的过程中,错误的做法是()
在应用ORS液的过程中,错误的作法是()
在应用ORS液的过程中,错误的是()
Mainly east 3 or 4 partly cloudy to overcast occasional rain()slowly south moderate or good.
()any case or suspected case of quarantinable disease,or any case of eruptive disease or any death be discovered,the local quarantine officer must be notified immediately.
Should any case or suspected case of quarantinable disease,or any case of eruptive disease or any death be discovered,the local Quarantine Officer must be()immediately.
Masters are()solely responsible for all damages or accidents of whatever kind resulting from the navigating or handling of their vessels by day or by night.
系统中雷达状态包括Unknown、Operational(or ON)、Failed(or OFF)、Detached。
The carrier is liable for loss of or damage to the goods or delay in delivery caused by fire,()the claimant proves that the fire arose from fault or neglect on the part of the carrier,his servants or agents.
Shutdown price(or point,or rule) 停业价格(或停业点、停业原则)
在Transact-SQL语句的WHERE子句中,完全可以用IN子查询来代替OR逻辑表达式。
设t=2,b=3,c=4,d=5,则下面语句输出的是( )。 Print3>2*b Or a=c And b<>c Or c>d
设a2,b=3,c=4,d=5,则下面语句的输出是Print 3>2*b Or a=c And b<>c Or c>d
设t=2,b=3,c=4,d=5,则下面语句输出的是( )。 Print3>2*b Or a=c And bc Or c>d
翻译:With Average or With Particular Average(WA or WPA)()
设a=′′a′′,b=′′b′′,c=′′c′′,d=′′d′′,执行语句x=IIf((ad),′′A′′,′′B′′)后,x的值为(  )。
有SQL语句: SELECT * FROM 教师 WHERE NOT (工资>3000 OR 工资<2000) 与如上语句等价的SQL语句是
广告位招租WX:84302438

免费的网站请分享给朋友吧