Examine the structure of the EMPLOYEES and DEPARTMENTS tables: EMPLOYEESColumn name Data type Remarks EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2 (30) JOB_ID VARCHAR2 (20) SALARY NUMBER MGR_ID NUMBER References EMPLOYEE_ID COLUMN DEPARTMEN

题目

Examine the structure of the EMPLOYEES and DEPARTMENTS tables: EMPLOYEESColumn name Data type Remarks EMPLOYEE_ID NUMBER NOT NULL, Primary Key EMP_NAME VARCHAR2 (30) JOB_ID VARCHAR2 (20) SALARY NUMBER MGR_ID NUMBER References EMPLOYEE_ID COLUMN DEPARTMENT ID NUMBER Foreign key to DEPARTMENT ID column of the DEPARTMENTS table DEPARTMENTSColumn name Data type Remarks DEPARTMENT_ID NUMBER NOT NULL, Primary Key DEPARTMENT_NAME VARCHAR2(30) MGR_ID NUMBER References MGR_ID column of the EMPLOYEES table Evaluate this SQL statement: SELECT employee_id, e.department_id, department_name, salary FROM employees e, departments d WHERE e. department_id = d.department_id; Which SQL statement is equivalent to the above SQL statement? ()

  • A、SELECT employee_id, department_id, department_name, salary FROM employees WHERE department_id IN (SELECT department_id FROM departments);
  • B、SELECT employee_id, department_id, department_name, salary FROM employees NATURAL JOIN departments;
  • C、SELECT employee_id, d.department_id, department_name, salary FROM employees e JOIN departments d ON e.department _ id = d. department_id;
  • D、SELECT employee_id, department_id, department_name, Salary FROM employees JOIN departments USING (e.department_id, d.department_id);

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更多“Examine the structure of the EM”相关问题
  • 第1题:

    Examine the structure of the EMPLOYEES table:What is the correct syntax for an inline view?()

    A.

    B.

    C.

    D.


    参考答案:A

  • 第2题:

    Examine the structure if the EMPLOYEES and NEW EMPLOYEES tables:Which MERGE statement is valid?()

    A.

    B.

    C.

    D.


    参考答案:A

  • 第3题:

    Examine the structure of the EMPLOYEES and NEW_EMPLOYEES tables:Which UPDATE statement is valid?()

    A.

    B.

    C.

    D.


    参考答案:A

  • 第4题:

    当()时,货币贬值使该国国际收支状况恶化。A:|ex+em|>1B:|ex+em|=1C:|ex+em|<1D:|ex+em|≤

    当()时,货币贬值使该国国际收支状况恶化。

    A:|ex+em|>1

    B:|ex+em|=1

    C:|ex+em|<1

    D:|ex+em|≤1


    答案:C

  • 第5题:

    哈伯格条件的数学表达形式为 ( )

    A.Ex+Em>1
    B.Ex+Em<1
    C.Ex+Em>1+m
    D.Ex+Em<1+m

    答案:C
    解析:
    此题考查哈伯格条件的基本概念。

  • 第6题:

    正弦交流电的电动势最大值Em电动势有效值E之间的关系为()。

    • A、Em=√3E;
    • B、Em=√2E;
    • C、Em=0.707E;
    • D、Em=1.57E

    正确答案:B

  • 第7题:

    对优等商品需求的收入弹性(Em)是()

    • A、Em<1
    • B、Em=0
    • C、Em>0
    • D、Em<0

    正确答案:C

  • 第8题:

    下列哪些项属于PLC的数字量输入输出扩展模块()

    • A、EM221
    • B、EM222
    • C、EM223
    • D、EM224
    • E、EM225

    正确答案:A,B,C

  • 第9题:

    指令EXEMP.RP=ALL,EM=ALL;输出的数据包括哪些?()

    • A、EM的状态
    • B、EM所带的设备
    • C、EM受控的RP的状态
    • D、EM受控于哪个RP
    • E、EM受控的RP的类型

    正确答案:A,B,D,E

  • 第10题:

    劣等商品需求的收入弹性是()。

    • A、1>Em>0
    • B、Em=0
    • C、Em<0
    • D、Em>1

    正确答案:C

  • 第11题:

    单选题
    View the Exhibit and examine the structure of the ORDERS table. Which task would require subqueries?  ()
    A

     displaying the total order value for sales representatives 161 and 163

    B

     displaying the order total for sales representative 161 in the year 1999

    C

     displaying the number of orders that have order mode online and order date in 1999

    D

     displaying the number of orders whose order total is more than the average order total for all online orders


    正确答案: D
    解析: 暂无解析

  • 第12题:

    单选题
    A data manipulation language statement ().
    A

    completes a transaction on a table

    B

    modifies the structure and data in a table

    C

    modifies the data but not the structure of a table

    D

    modifies the structure but not the data of a table


    正确答案: A
    解析: 暂无解析

  • 第13题:

    Examine the structure of the EMPLOYEES table:You issue these statements:At the end of this transaction, what is true?()

    A. You have no rows in the table.

    B. You have an employee with the name of James.

    C. You cannot roll back to the same savepoint more than once.

    D. Your last update fails to update any rows because employee ID 180 was already eleted.


    参考答案:A

  • 第14题:

    Examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.Which two SQL statements produce the name, department name, and the city of all the employees who earn more then 10000?()

    A.

    B.

    C.

    D.


    参考答案:B, D

  • 第15题:

    Examine the structure of the EMPLOYEES and DEPARTMENTS tables:Evaluate this SQL statement:Which SQL statement is equivalent to the above SQL statement?()

    A.

    B.

    C.

    D.


    参考答案:C

  • 第16题:

    下面四项,合法的电子邮件地址是()。

    A.wang-em.info.net

    B.em.info.net-wang

    C.em.info.net@wang

    D.wang@em.info.net


    正确答案:D


  • 第17题:

    对劣质商品需求的收入弹性(Em)是()。

    • A、Em< 1
    • B、Em =0
    • C、Em<0
    • D、Em>0

    正确答案:C

  • 第18题:

    慢代谢者(PM),快代谢者(EM),快代谢者又分为纯合子EM和杂合子EM,在相同剂量下,他们体内血药浓度比较()

    • A、杂合子EM=纯合子EM>PM
    • B、纯合子EM>杂合子EM>PM
    • C、PM>纯合子EM=杂合子EM
    • D、PM>杂合子EM>纯合子EM

    正确答案:D

  • 第19题:

    $(“div”).find(“em”;)与下面哪句功能一致?()

    • A、$("div>em")
    • B、$("div em")
    • C、$("div").has("em")
    • D、$("div").children().is("em")

    正确答案:B

  • 第20题:

    强调显示标记<em></em>


    正确答案:正确

  • 第21题:

    在匹配的em元素中筛选出第二个em?()

    • A、$("em").eq(-2)
    • B、$("em").eq(2)
    • C、$("em").eq(0)
    • D、$("em").eq(1)

    正确答案:D

  • 第22题:

    需求收入弹性Em的取值为多少的时候商品是奢侈品?()

    • A、Em<0
    • B、Em>0
    • C、Em>1
    • D、1>Em>0

    正确答案:C

  • 第23题:

    单选题
    在匹配的em元素中筛选出第二个em?()
    A

    $(em).eq(-2)

    B

    $(em).eq(2)

    C

    $(em).eq(0)

    D

    $(em).eq(1)


    正确答案: A
    解析: 暂无解析

  • 第24题:

    单选题
    $(“div”).find(“em”;)与下面哪句功能一致?()
    A

    $(div>em)

    B

    $(div em)

    C

    $(div).has(em)

    D

    $(div).children().is(em)


    正确答案: C
    解析: 暂无解析