建立一个学生信息表student,要求它由学号sno,姓名sname,性别sex,年龄age,4个属性组成,其学号属性
A.CREATE TABLE student (sno char(5)NOT NUIL sname char(8)NOT NULL sex char(1) age int);
B.CREATE TABLE student (sno char(5)NOT NULL UNIQUE sname char(8) Sex char(1) age int);
C.CREATE TABLE (sno char(5)NOT NULL UNIQUE sname char(8)NOT NULL sex char(1) age int);
D.CREATE TABLE student (sno char(5)NOT NULL UNIQUE sname char(8)NOT NULL Sex char(1) age int);