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要给学生信息表(STUDENT)增加一个出生日期字段(日期型)，下面正确的是____
A CREATE TABLE STUDENT ADD COLUMN 出生日期 DATETIME
B ALTER TABLE STUDENT ALTER COLUMN 出生日期 DATETIME
C ALTER TABLE STUDENT ADD COLUMN 出生日期 DATETIME
D ALTER TABLE STUDENT SET COLUMN 出生日期 DATETIME
参考答案
更多 “ 要给学生信息表(STUDENT)增加一个出生日期字段(日期型)，下面正确的是____A CREATE TABLE STUDENT ADD COLUMN 出生日期 DATETIMEB ALTER TABLE STUDENT ALTER COLUMN 出生日期 DATETIMEC ALTER TABLE STUDENT ADD COLUMN 出生日期 DATETIMED ALTER TABLE STUDENT SET COLUMN 出生日期 DATETIME ” 相关考题
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You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.Which statement accomplishes this task?（）A、ALTER TABLE students ADD PRIMARY KEY student_id;B、ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student _ id);C、ALTER TABLE students ADD CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);D、ALTER TABLE students MODIFY CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);
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You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty. Which statement accomplishes this task?（）A、ALTER TABLE students ADD PRIMARY KEY _ id;B、ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);C、ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;D、ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);E、ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
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You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty. Which statement accomplishes this task?（）A、ALTER TABLE students ADD PRIMARY KEY student_id;B、ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);C、ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;D、ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);E、ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
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单选题删除student表的“平均成绩”字段的正确SQL命令是（ ）。A
DELETE TABLE student DELETE COLUMN平均成绩B
ALTER TABLE student DELETE COLUMN平均成绩C
ALTER TABLE student DROP COLUMN平均成绩D
DELETE TABLE student DROP COLUMN平均成绩
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