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之前已经创建了一个Student的表，Age有数据类型为Int，现在改为smallint应该( )写。
A.ALTER TABLE student ALTER COLUMN sage smallint
B.ALTER TABLE student ALTER COLUMN age smallint
C.ALTER TABLE student ALTER MODIFY age smallint
D.ALTER TABLE student MODIFY sage smallint
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更多 “ 之前已经创建了一个Student的表，Age有数据类型为Int，现在改为smallint应该( )写。A.ALTER TABLE student ALTER COLUMN sage smallintB.ALTER TABLE student ALTER COLUMN age smallintC.ALTER TABLE student ALTER MODIFY age smallintD.ALTER TABLE student MODIFY sage smallint ” 相关考题
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之前已经创建了一个Student的表，Age的数据类型为Int，现在改为Smallint应该（）写。A、ALTERTABLEstudentMODIFYsagesmallintB、ALTERTABLEstudentALTERCOLUMNagesmallintC、ALTERTABLEstudentALTERMODIFYagesmallintD、ALTERTABLEstudentALTERCOLUMNsagesmallint
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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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Which statement explicitly names a constraint?（）A、ALTER TABLE student_grades ADD FOREIGN KEY (student_id) REFERENCES students(student_id);B、ALTER TABLE student_grades ADD CONSTRAINT NAME = student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);C、ALTER TABLE student_grades ADD CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);D、ALTER TABLE student grades ADD NAMED CONSTRAINT student_id_fk FOREIGN KEY (student_id) REFERENCES students(student_id);E、ALTER TABLE student grades ADD NAME student_id_fk FOREIGN KEY (student_id) REFERENCES students(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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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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