考试
2021-02-19 07:50:38

(单选题)You need to modify the ST

题目描述

AALTER TABLE students ADD PRIMARY KEY student_id;

BALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);

CALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;

DALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

EALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);

答案解析

[db:答案解析]

D

加载中...
AI正在思考中,请稍候...