單項選擇題

Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table?（）

A. CREATE TABLE EMP (empno NUMBER(4), ename VARCNAR2(35), deptno NUMBER(7,2) NOT NULL CONSTRAINT emp_deptno_fk FOREIGN KEY deptno REFERENCES dept deptno);
B. CREATE TABLE EMP (empno NUMBER(4), ename VARCNAR2(35), deptno NUMBER(7,2) CONSTRAINT emp_deptno_fk REFERENCES dept (deptno));
C. CREATE TABLE EMP (empno NUMBER(4) ename VARCHAR2(35), deptno NUMBER(7,2) NOT NULL, CONSTRAINT emp_deptno_fk REFERENCES dept (deptno) FOREIGN KEY (deptno));
D. CREATE TABLE EMP (empno NUMBER(4), ename VARCNAR2(35), deptno NUMBER(7,2) FOREIGN KEY CONSTRAINT emp deptno fk REFERENCES dept (deptno));

你可能感興趣的試題

單項選擇題

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);

多項選擇題

Which three are DATETIME data types that can be used when specifying column definitions? （）

A. TIMESTAMP
B. INTERVAL MONTH TO DAY
C. INTERVAL DAY TO SECOND
D. INTERVAL YEAR TO MONTH
E. TIMESTAMP WITH DATABASE TIMEZONE

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Which SQL statement defines the FOREIGN KEY constraint on the DEPTNO column of the EMP table?（）

你可能感興趣的試題

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?（）

Which three are DATETIME data types that can be used when specifying column definitions? （）