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。现在对这个现有
A.ALTER TABLE student ADD cometime DATE NOT NULL;
B.ALTER TABLE student ADD cometime DATE;
C.ALTER TABLE student DROP cometime DATE NOT NULL:
D.ALTER TABLE student MODIFY cometime DATE;
A.ALTER TABLE student ADD cometime DATE NOT NULL;
B.ALTER TABLE student ADD cometime DATE;
C.ALTER TABLE student DROP cometime DATE NOT NULL:
D.ALTER TABLE student MODIFY cometime DATE;
A.CREATE TABLE student(sno char(5) NOT NULL 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);
A.CREATE TABLE student (sno char(5)NOT NULL sname char(8)NOT NULL sex char age int);
B.CREATE TABLE student (sno char(5)NOT NULL UNIQUE sname char(8) sex char age int);
C.CREATE TABLE (sno char(5)NOT NULL UNIQUE sname char(8)NOT NULL sex char age int);
D.CREATE TABLE student (sno char(5)NOT NULL UNIQUE sname char(8)NOT NULL sex char age int);
A.CREATE TABLE student (sno char(5)NOT NULL sname char(8)NOT NULL sex char(1) age int);
B.CREATE TABLE student (sno char(5)NOT NULL sname char(8)NOT NULL 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);
A.CREATE TABLE student (sno char(5) NOT NULL sname char(8) NOT NULL sex char(1) age int);
B.CREATE TABLE atudent (sno char(5) NOT NULL UNIQUE sname char(8) sexchar(1) age int);
C.CREATE TABLE (sno char(5) NOT NULL UNIQUE sname char(8) NOT NULL sex char(1) age iht);
D.CREATE TABLE student (sno char(5) NOT NULL UNIQUE shame char(8) NOT NULL sex char(1) age int);
A.CREATE TABLE student (sno char(5) NOT NULL 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);
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);
A.ALTER TABLE student ADD cometime DATE NOT NULL;
B.ALTER TABLE student ADD cometime DATE;
C.ALTER TABLE student DROP cometime DATE NOT NULL;
D.ALTER TABLE student MODIFY cometime DATE;
A.AITER TABLE student ADD cometime DATE NOT NULL;
B.ALTER TABLE student ADD cometime DATE;
C.ALTER TABLE student DROP cometime DATE NOT NULL;
D.ALTER TABLE student MODIPY cometime DATE;
A.ALTER TABLE student ADD cometime DATE NOT NULL;
B.ALTER TABLE sudent ADD cometime DATE;
C.AlTER TABLE student DROP cometime DATE NOT NULL;
D.ALTER TABLE sudent MODIFY cometime DATE;
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