在Oracle中,用ALTER将scott的口令改为hello,下列哪个是正确的?( )
AALTER USER scott IDENTIFIED BY hello
BALTER scott USER IDENTIFIED BY hello
CALTER USER scott IDENTIFIED AS hello
DALTER USER hello IDENTIFIED BY scott
AALTER USER scott IDENTIFIED BY hello
BALTER scott USER IDENTIFIED BY hello
CALTER USER scott IDENTIFIED AS hello
DALTER USER hello IDENTIFIED BY scott