Examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.EMPLOYEESNOT NULL,EMPLOYEE_ID NUMBERPrimary KeyVARCHAR2EMP_NAME(30)VARCHAR2JOB_ID(20)SALARY NUMBERReferencesMGR_ID NUMBEREMPLOYEE_IDcolumnDEPARTMENT_ID NUMBER Foreign key toDEPARTME

题目

Examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.EMPLOYEESNOT NULL,EMPLOYEE_ID NUMBERPrimary KeyVARCHAR2EMP_NAME(30)VARCHAR2JOB_ID(20)SALARY NUMBERReferencesMGR_ID NUMBEREMPLOYEE_IDcolumnDEPARTMENT_ID NUMBER Foreign key toDEPARTMENT_IDcolumn of theDEPARTMENTStableDEPARTMENTSNOT NULL, PrimaryDEPARTMENT_ID NUMBERKeyVARCHAR2DEPARTMENT_NAME(30)References NGR_IDMGR_ID NUMBERcolumn ofthe EMPLOYEES tableForeign key toLOCATION_ID NUMBERLOCATION_IDcolumn of theLOCATIONS tableLOCATIONSNOT NULL, PrimaryLOCATION_ID NUMBERKeyVARCHAR2CITY|30)Which two SQL statements produce the name, department name, and the city of all the employees who earn more then 10000?（）

A. SELECT emp_name, department_name, city FROM employees e JOIN departments d USING (department_id) JOIN locations 1 USING (location_id) WHERE salary > 10000;

B. SELECT emp_name, department_name, city FROM employees e, departments d, locations 1 JOIN ON (e.department_id = d.department id) AND (d.location_id =1.location_id) AND salary > 10000;

C. SELECT emp_name, department_name, city FROM employees e, departments d, locations 1 WHERE salary > 10000;

D. SELECT emp_name, department_name, city FROM employees e, departments d, locations 1 WHERE e.department_id = d.department_id AND d.location_id = 1.location_id AND salary > 10000;

E. SELECT emp_name, department_name, city FROM employees e NATURAL JOIN departments, locations WHERE salary > 10000;

相似考题

1.现有如下两个关系模式：Employees(Eid，Name，DeptNO)Departments(DeptNO，DeptName，TotalNumber)Employees关系模式描述了职工编号、姓名和所在部门编号；Departments关系模式描述了部门编号、名称和职工总人数。请按SQL Server所采用的’rransact—SQL语法格式编写实现具有如下功能的后触发型触发器：每当在Employees表中插入一行数据时，相应部门的职工总人数就加1。

2.I think the door is locked. But I'll go and ().A、checkB、examine

3.（ 2 ）现有如下两个关系模式：Employees （ Eid ， Name ， DeptNO ）Departments （ DeptNO ， DeptName ， TotalNumber ）Employees 关系模式描述了职工编号、姓名和所在部门编号； Departments 关系模式描述了部门编号、名称和职工总人数。请 按 SQL Serve r 所采用 的 Tansact — SQ L 语法格式编写实现具有功能的后触发型触发器 ： 每当在Employee s表中插入一行数据时，相应部门的职工总人数就加 1 。（ 10 分）

4.在执行语句SELECT department_id FROM employees,departments WHERE employees.department_id= departments.department_id;时报错,原因是()。A.没有给表employees和表departments加别名B.没有给列department_id加别名C.不能用employees.department_id=departments.department_id作为条件D.SELECT后面的department_id没有指定是哪个表

参考答案和解析
参考答案：A, D
更多“Examine the structure of the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables.EMPLOYEESNOT NUL ”相关问题

  • 第1题：

    After __________ (examine) the lady, the doctor suggested that his back was badly hurt in the accident.


    参考答案：being examined

  • 第2题：

    检查

    A.expect

    B.except

    C.excuse

    D.examine


    正确答案：D

  • 第3题：

    He rolled up his trouer leg to exhibit his wounded knee.

    A:spread
    B:open
    C:show
    D:examine

    答案：C
    解析：
    本句意思：他卷起他的裤腿来显露受伤的膝盖。exhibit展示，显示。spread伸开，展开；open打开；show展示，出示；examine检查。

  • 第4题：

    已知关系模式R的全部属性集U={A，B，C，D，E，G}及函数依赖集：

    F=(AB→C，C→A，BC→D，ACD→B，D→EG，BE→C，CG→BD，CE→AG}求属性集闭包(BD)+

    (2) 现有如下两个关系模式：

    Employees(Eid，Name，DeptNO)

    Departments(DeptNO，DeptName，TotalNumber)

    Employees关系模式描述了职工编号、姓名和所在部门编号；Departments关系模式描述了部门编号、名称和职工总


    正确答案：(BD)+=ABCDEG X(O)=BD；由D→EG可知X(1) =BDEG；再由BE→C可知X(2)→BDEGC；又有CG→BDCE→AG可知X(3)=BDEGCA因为X(3)中包含了所有的属性集即有(BD)+=X(3)=ABCDEG T—C(TNO．CNO)主码(TNOCNO)外码TNOCNO S—C(SNOCNO成绩)主码(SNOCNO)．外码SNOCNO (2) create trigger sql_tri on employees for
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    CREATE TRIGGER触发器名称
    0N |表名|视图名|
    [WITH ENCRYPTION]
    AS
    SQL语句
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  • 第5题：

    ［A］districts ［B］vicinities ［C］resorts ［D］locations


    正确答案：D

    本题考查名词词义的辨析。空格处填入的名词作pick-up（物品收取）修饰的中心名词，说明东日本铁路公司想把车站作为物品收取的什么。district指有一定特色的区域、地区，如rural/mountainous/financial/theatre district；或行政区域，如election/school/postal district。vicinity“临近地区，附近”，常用单数，如the inhabitants of the vicinity（附近地区的居民）。resort“旅游、度假胜地”，如seaside/beach/ski resort。Location泛指某个地点，与文中pick-up搭配，意为：物品收取地，符合文意。

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