单选题Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SEL

题目
单选题
Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks; What is the result of the SELECT statement? （）
A

The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.

B

The statement returns an error at the SELECT clause.

C

The statement returns an error at the WHERE clause.

D

The statement returns an error at the ORDER BY clause.

相似考题

1.3 The ‘person specification’ is derived from the job description.Required:(a) Explain what is meant by the terms:(i) ‘person specification’; (4 marks)

2.(ii) Describe the procedures to verify the number of serious accidents in the year ended 30 November 2007.(4 marks)

3.Examine the description of the MARKS table:SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.Examine this SELECT statement based on the MARKS table:What is the result of the SELECT statement?（）A. The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.B. The statement returns an error at the SELECT clause.C. The statement returns an error at the WHERE clause.D. The statement returns an error at the ORDER BY clause.

4.(ii) ‘job description’. (4 marks)

更多“Examine the description of the MARKS table: STD_ID NUMBER(4)”相关问题

  • 第1题：

    Examine the following command:CREATE TABLE (prod_id number(4),Prod_name varchar2 (20),Category_id number(30),Quantity_on_hand number (3) INVISIBLE);Which three statements are true about using an invisible column in the PRODUCTS table?（）

    A. The %ROWTYPE attribute declarations in PL/SQL to access a row will not display the invisible column in the output.

    B. The DESCRIBE commands in SQL *Plus will not display the invisible column in the output.

    C. Referential integrity constraint cannot be set on the invisible column.

    D. The invisible column cannot be made visible and can only be marked as unused.

    E. A primary key constraint can be added on the invisible column.


    参考答案：A, B, C

  • 第2题：

    Examine the command that is used to create a table： SQL> CREATE TABLE orders（oid NUMBER（6） PRIMARY KEY， odate DATE， ccode NUMBER （6）， oamtNUMBER（10，2）） TABLESPACE users； Which two statements are true about the effect of the above command（）

    • A、A CHECK constraint is created on the OID column.
    • B、A NOT NULL constraint is created on the OID column.
    • C、The ORDERS table is the only object created in the USERS tablespace.
    • D、The ORDERS table and a unique index are created in the USERS tablespace.
    • E、The ORDERS table is created in the USERS tablespace and a unique index is created on the OID columnin the SYSTEM tablespace.

    正确答案:B,D

  • 第3题：

    Examine the command that is used to create a table：  SQL> CREATE TABLE orders（oid NUMBER（6） PRIMARY KEY， odate DATE， ccode NUMBER（6）， oamt NUMBER（10，2）） TABLESPACE users；  Which two statements are true about the effect of the above command） （）

    • A、A CHECK constraint is created on the OID column.
    • B、A NOT NULL constraint is created on the OID column.
    • C、The ORDERS table is the only object created in the USERS tablespace.
    • D、The ORDERS table and a unique index are created in the USERS tablespace.
    • E、The ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.

    正确答案:B,D

  • 第4题：

    多选题
    Examine the command that is used to create a table： SQL> CREATE TABLE orders（oid NUMBER（6） PRIMARY KEY， odate DATE， ccode NUMBER （6）， oamtNUMBER（10，2）） TABLESPACE users； Which two statements are true about the effect of the above command（）
    A

    A CHECK constraint is created on the OID column.

    B

    A NOT NULL constraint is created on the OID column.

    C

    The ORDERS table is the only object created in the USERS tablespace.

    D

    The ORDERS table and a unique index are created in the USERS tablespace.

    E

    The ORDERS table is created in the USERS tablespace and a unique index is created on the OID columnin the SYSTEM tablespace.


    正确答案： B,C
    解析： 暂无解析

  • 第5题：

    单选题
    Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks; What is the result of the SELECT statement?（）
    A

    The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.

    B

    The statement returns an error at the SELECT clause.

    C

    The statement returns an error at the WHERE clause.

    D

    The statement returns an error at the ORDER BY clause.


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    Examine the description of the EMPLOYEES table: EMP_ID NUMBER(4) NOT NULL LAST_NAME VARCHAR2(30) NOT NULL FIRST_NAME VARCHAR2(30) DEPT_ID NUMBER(2) Which statement produces the number of different departments that have employees with last name Smith? （）
    A

    SELECT COUNT (*) FROM employees WHERE last _name='smith';

    B

    SELECT COUNT (dept_id) FROM employees WHERE last _name='smith';

    C

    SELECT DISTINCT (COUNT (dept_id) FROM employees WHERE last _name='smith';

    D

    SELECT COUNT (DISTINCT dept_id) FROM employees WHERE last _name='smith';

    E

    SELECT UNIQE (dept_id) FROM employees WHERE last _name='smith';


    正确答案： D
    解析： 暂无解析

  • 第7题：

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

    CREATE TABLE EMP (empno NUMBER(4), ename VARCHAR2(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 VARCHAR2(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 VARCHAR2(35), deptno NUMBER(7,2) FOREIGN KEY CONSTRAINT emp_deptno_fk REFERENCES dept (deptno));


    正确答案： A
    解析： 暂无解析

  • 第8题：

    多选题
    Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ3 NUMBER(3) SUBJ1, SUBJ2, and SUBJ3 indicate the marks (grades) obtained by a student in the three subjects. Which two statements are valid? （）
    A

    SELECT SUM(subj1, subj2, subj3) FROM marks;

    B

    SELECT SUM(subj1 + subj2 + subj3) FROM marks;

    C

    SELECT SUM(subj1), SUM(subj2), SUM(subj3) FROM marks;

    D

    SELECT MAX(subj1, subj2, subj3) FROM marks;

    E

    SELECT MINIMUM(subj1) FROM marks;

    F

    SELECT COUNT(std_id) FROM marks WHERE subj1 >= AVG(subj1);


    正确答案： D,F
    解析： 暂无解析

  • 第9题：

    单选题
    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));


    正确答案： C
    解析： 暂无解析

  • 第10题：

    Marks and Nos.，Number and kind of packages，description of goods should be declared in ______.

    A.SHIP'S STORE LIST

    B.PERSONAL EFFECTS LIST

    C.CARGO DECLARATION

    D.GENERAL DECLARATION


    正确答案：C

  • 第11题：

    You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 1000 bytes. The column can currently hold 500 bytes per value. The table contains 20000 rows. Which statement is valid?（）

    • A、ALTER TABLE commercials MODIFY (description CHAR2(1000));
    • B、ALTER TABLE commercials CHANGE (description CHAR2(1000));
    • C、ALTER TABLE commercials CHANGE (description VARCHAR2(1000));
    • D、ALTER TABLE commercials MODIFY (description VARCHAR2(1000));
    • E、You cannot increase the size of a column if the table has rows.

    正确答案:D

  • 第12题：

    单选题
    Examine the description of the MARKS table: STD_ID NUMBER(4) STUDENT_NAME VARCHAR2(30) SUBJ1 NUMBER(3) SUBJ2 NUMBER(3) SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects. Examine this SELECT statement based on the MARKS table: SELECT subj1+subj2 total_marks, std_id FROM marks WHERE subj1 > AVG(subj1) AND subj2 > AVG(subj2) ORDER BY total_ marks; What is the result of the SELECT statement?（）
    A

    The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.

    B

    The statement returns an error at the SELECT clause.

    C

    The statement returns an error at the WHERE clause.

    D

    The statement returns an error at the ORDER BY clause.


    正确答案： D
    解析： 暂无解析

  • 第13题：

    多选题
    Examine the command that is used to create a table：  SQL> CREATE TABLE orders（oid NUMBER（6） PRIMARY KEY， odate DATE， ccode NUMBER（6）， oamt NUMBER（10，2）） TABLESPACE users；  Which two statements are true about the effect of the above command） （）
    A

    A CHECK constraint is created on the OID column.

    B

    A NOT NULL constraint is created on the OID column.

    C

    The ORDERS table is the only object created in the USERS tablespace.

    D

    The ORDERS table and a unique index are created in the USERS tablespace.

    E

    The ORDERS table is created in the USERS tablespace and a unique index is created on the OIDcolumn in the SYSTEM tablespace.


    正确答案： E,D
    解析： 暂无解析

  • 第14题：

    单选题
    You need to change the definition of an existing table. The COMMERCIALS table needs its DESCRIPTION column changed to hold varying length characters up to 2000 bytes. The column can currently hold 1000 bytes per value. The table contains 20000 rows. Which statement is valid?（）
    A

    ALTER TABLE commercials MODIFY (description CHAR2(2000));

    B

    ALTER TABLE commercials CHANGE (description CHAR2(2000));

    C

    ALTER TABLE commercials CHANGE (description VARCHAR2 (2000));

    D

    ALTER TABLE commercials MODIFY (description VARCHAR2 (2000));

    E

    You cannot increase the size of a column if the table has rows.


    正确答案： B
    解析： 暂无解析

  • 第15题：

    多选题
    Examine the SQL statements that creates ORDERS table: CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL STATUS VARCHARD2(10) CHECK (status IN ('CREDIT','CASH')), PROD_ID_NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order id, order date)); For which columns would an index be automatically created when you execute the aboveSQL statement? （）
    A

    SER_NO

    B

    ORDER_ID

    C

    STATUS

    D

    PROD_ID

    E

    ORD_TOTAL

    F

    Composite index on ORDER_ID and ORDER_DATE


    正确答案： C,A
    解析： 暂无解析

  • 第16题：

    多选题
    Examine the description of the STUDENTS table: STD_ID NUMBER(4) COURSE_ID VARCHAR2(10) START_DATE DATE END_DATE DATE Which two aggregate functions are valid on the START_DATE column? （　）
    A

    SUM（start_date）

    B

    AVG（start_date）

    C

    COUNT（start_date）

    D

    AVG（start_date，end_date）

    E

    MIN（start_date）

    F

    MAXIMUM（start_date）


    正确答案： F,A
    解析： 暂无解析

  • 第17题：

    单选题
    Marks and Nos.，Number and kind of packages，description of goods should be declared in （）.
    A

    SHIP'S STORE LIST

    B

    PERSONAL EFFECTS LIST

    C

    CARGO DECLARATION

    D

    GENERAL DECLARATION


    正确答案： C
    解析： 暂无解析

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