【单选题】
A if exists(select * from sysdatabases where name = 'bookDb')
drop database bookDb
go
B fexists(selec * from sysobjects where name = 'bookDb')
drop database bookDb go
C while(exists(select * from sysdatabases wnere name= 'bO0kDb'))drop database bookDb bo
D 以上写法都不对
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