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【单选题】
如果有"学生表"(学号,姓名,专业),要将删除字段"专业"的全部内容,应使用的查询是( )。
A.
操作查询包括生成表查询、删除查询、更新查询以及追加查询。追加查询从一个或多个表中将一组记录添加到一个或多个表的尾部;删除查询可以从一个或多个表中删除一组记录,删除查询将删除整个记录,而不只是记录中所选择的字段;生成表查询从一个或多个表中提取有用数据,创建新表的查询,若数据库中已有同名的表,该操作将覆盖原有的表;更新查询是对一个或多个表中的一组记录作全部更新,可以十分简单、快捷地对大量的并且符合一定条件的数据进行更新和修改。本题中要删除字段"专业"的全部内容,应使用更新查询。因此选项B正确。
B.
追加查询
C.
更新查询
D.
删除查询
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参考答案：
举一反三
【单选题】______ a language family is a group of languages with a common origin and similar vocabulary, grammar, and sound system.
A.
What linguists call
B.
It is called by linguists
C.
Linguists call it
D.
What do linguists call
查看完整题目与答案
【单选题】Prior to the 20th century, many languages with small numbers of speakers survived for centuries. The increasingly interconnected modern world makes it much more difficult for small language communitie...
A.
an increasingly interconnected world
B.
maintaining small numbers of speakers
C.
relatively isolated language communities
D.
following the tradition of the 20th century
查看完整题目与答案
【判断题】Children can acquire two or more first languages with ease.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Prior to the 20th century, many languages with small numbers of speakers survived for centuries. The increasingly interconnected modern world makes it much more difficult for small language communitie...
A.
in the interconnected modern world
B.
in relatively isolated language communities
C.
if cultural groups wish to keep their native languages
D.
if minority language speakers insist on using their own languages
查看完整题目与答案
【单选题】Languages with _____ generally possess a much larger number of devices of overt gender marking.
A.
Social gender
B.
grammatical gender
C.
cultural gender
D.
lexical gender
查看完整题目与答案
【单选题】Although _______ are simplified languages with reduced grammatical features, they are rule-governed, like any human language.
A.
vernacular languages
B.
creoles
C.
pidgins
D.
sociolects
查看完整题目与答案
【判断题】纯粹理性批判在自然科学领域和道德领域都否定了上帝的存在。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】纯粹理性批判在道德领域和自然科学领域都否定了上帝的存在。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】欧洲流传至今最早而又最完整的一部史诗是冰岛的《埃达》。
A.
正确
B.
错误
查看完整题目与答案
【多选题】Examples of“gender languages” or “languages with grammatical gender”are ____.
A.
German
B.
Italian
C.
French
D.
Russian
查看完整题目与答案
相关题目：
【单选题】______ a language family is a group of languages with a common origin and similar vocabulary, grammar, and sound system.
A.
What linguists call
B.
It is called by linguists
C.
Linguists call it
D.
What do linguists call
查看完整题目与答案
【单选题】Prior to the 20th century, many languages with small numbers of speakers survived for centuries. The increasingly interconnected modern world makes it much more difficult for small language communitie...
A.
an increasingly interconnected world
B.
maintaining small numbers of speakers
C.
relatively isolated language communities
D.
following the tradition of the 20th century
查看完整题目与答案
【判断题】Children can acquire two or more first languages with ease.
A.
正确
B.
错误
查看完整题目与答案
【单选题】Prior to the 20th century, many languages with small numbers of speakers survived for centuries. The increasingly interconnected modern world makes it much more difficult for small language communitie...
A.
in the interconnected modern world
B.
in relatively isolated language communities
C.
if cultural groups wish to keep their native languages
D.
if minority language speakers insist on using their own languages
查看完整题目与答案
【单选题】Languages with _____ generally possess a much larger number of devices of overt gender marking.
A.
Social gender
B.
grammatical gender
C.
cultural gender
D.
lexical gender
查看完整题目与答案
【单选题】Although _______ are simplified languages with reduced grammatical features, they are rule-governed, like any human language.
A.
vernacular languages
B.
creoles
C.
pidgins
D.
sociolects
查看完整题目与答案
【判断题】纯粹理性批判在自然科学领域和道德领域都否定了上帝的存在。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】纯粹理性批判在道德领域和自然科学领域都否定了上帝的存在。()
A.
正确
B.
错误
查看完整题目与答案
【判断题】欧洲流传至今最早而又最完整的一部史诗是冰岛的《埃达》。
A.
正确
B.
错误
查看完整题目与答案
【多选题】Examples of“gender languages” or “languages with grammatical gender”are ____.
A.
German
B.
Italian
C.
French
D.
Russian
查看完整题目与答案
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