A. create table orderinfo(
orderid char(6) not null unique primary key,
price decimal not null,
amount int not null
);
B. create table orderinfo(
orderid varchar(6) not null unique primary key,
price float not null,
amount int not null
);
C. create orderinfo(
orderid varchar(6) not null unique primary key,
price float not null,
amount int not null
);
D. create orderinfo(
orderid char(6) not null unique primary key,
price float not null,
amount int not null
);

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