BookStore数据库中有出版社表Publisher(PublisherCode,Publisher,Telephone)在某SQL语句中，WHEREPublisherCodeIN('21','31&

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

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