把表Book 中PubComp 的类型varchar(28)改为varchar(30)
A、ALTERTABLEBookALTERCOLUMNPubCompvarchar(30)NOTNULL
B、ALTERTABLEBookALTERCOLUMNPubCompvarchar(28)tovarchar(30)
C、useBookALTERCOLUMNPubCompvarchar(30)
D、其余选项全错
发布时间:2024-09-16 22:16:20
A、ALTERTABLEBookALTERCOLUMNPubCompvarchar(30)NOTNULL
B、ALTERTABLEBookALTERCOLUMNPubCompvarchar(28)tovarchar(30)
C、useBookALTERCOLUMNPubCompvarchar(30)
D、其余选项全错