下面选项中,可以将数据库itcast的编码修改为gbk的是
A.
ALTER DATABASE itcast DEFAULT CHARACTER SET gbk COLLATE gbk_bin;
B.
ALTER DATABASE itcast CHARACTER SET gbk COLLATE gbk_bin;
C.
CREATE DATABASE itcast DEFAULT CHARACTER SET gbk COLLATE gbk_bin;
D.
ALTER DATABASE itcast DEFAULT CHARACTER SET=gbk COLLATE gbk_bin;