BookStore数据库中有出版社表Publisher(PublisherCode,Publisher,Telephone)在某SQL语句中,WHEREPublisherCodeIN('21','31')子句等价于________。


BookStore数据库中有出版社表Publisher(PublisherCode,Publisher,Telephone)在某SQL语句中,WHEREPublisherCodeIN('21','31')子句等价于________。

A.PublisherCode='21'ANDPublisherCode='31'

B.PublisherCode='21'ORPublisherCode='31'

C.PublisherCode<='31'ANDPublisherCode>='21'

D.PublisherCode<'31'ANDPublisherCode>'21'

正确答案:B


Tag:信息系统与数据库技术 子句 语句 时间:2021-03-08 16:01:50