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A table was created using the following DDL:CREATE TABLE employee (id SMALLINT NOT NULL, name VARCHAR(9), dept SMALLINT CHECK (dept BETWEEN 10 AND 100),job CHAR(10) CHECK (job IN (‘Sales‘,‘Mgr‘,‘Clerk‘)), hiredate DATE, salary DECIMAL(7,2), comm DECIMAL(7

题目

A table was created using the following DDL:CREATE TABLE employee (id SMALLINT NOT NULL, name VARCHAR(9), dept SMALLINT CHECK (dept BETWEEN 10 AND 100),job CHAR(10) CHECK (job IN (‘Sales‘,‘Mgr‘,‘Clerk‘)), hiredate DATE, salary DECIMAL(7,2), comm DECIMAL(7,2), PRIMARY KEY (id), CONSTRAINT yearsal CHECK (YEAR(hiredate) > 2004 OR salary > 80500) );Which of the following INSERT statements will fail?()

A.INSERT INTO employee VALUES (2, ‘Smith‘, 80, ‘Mgr‘, ‘09/03/2006‘, 80000, NULL)

B.INSERT INTO employee VALUES (4, ‘Smith‘, 86, ‘Mgr‘, ‘07/14/2003‘, 90000, NULL)

C.INSERT INTO employee VALUES (1, ‘Smith‘, 55, ‘Sales‘, ‘07/14/2003‘, NULL, NULL)

D.INSERT INTO employee VALUES (3, ‘Smith‘, 33, ‘Analyst‘, ‘11/26/2006‘, 90000, NULL)


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  • 第1题:

    有Table1,Table2两表,Table2是Table1的从表,Table1表有字段head_id(主键)和head_name,Table2表有字段Line_id(主键),head_id(外键),line_name,现要求查询统计出有那些hand_name在Table2表中有2条以上的数据。请写出你的SQL语句。


    正确答案:select t1.head_name, count(1)   from Table1 t1, Table2 t2  where t1. head_id = t2. head_id  group by t1.head_name  having count(1)>2  

  • 第2题:

    【单选题】对于建立在数据库上的DDL触发器,常用的激活DDL触发器的事件不包括()

    A.Create_Table,Alter_Table,Drop_Table

    B.Create_View,Alter_View,Drop_View

    C.Create_Procedure,Alter_Procedure,Drop_Procedure

    D.Rollback


    Rollback

  • 第3题:

    如果TABLE为数据段中0032单元的符号名,其中存放的内容为1234H,当执行指令”MOV AX,TABLE”和”LEA AX,TABLE”后,(AX)中的内容分别为多少?

    A.执行MOV AX , TABLE后(AX)=1234H

    B.执行LEA AX, TABLE 后 (AX)=0032H.

    C.执行MOV AX , TABLE后(AX)=0032H

    D.执行LEA AX, TABLE 后 (AX)=1234H


    1234H,0032H

  • 第4题:

    已知基类Employee只有一个构造函数,其定义如下: Employee::Employee(int n):id(n){ } Manager是Employee的派生类,则下列对Manager的构造函数的定义中,正确的是?

    A.Manager::Manager(int n):id(n){}

    B.Manager::Manager(int n){id=n;}

    C.Manager::Manager(int n):Employee(n){}

    D.Manager::Manager(int n){Employee(n);}


    Manger::manger(int n):Employee(n){}

  • 第5题:

    动画演示圆心在原点,半径为n的有色圆盘, n=1,2...5, T={Red,Blue,Yellow,Green,Orange};

    A.ListAnimate[Table[Graphics[{T[[n]],Disk[{0,0},n]}, PlotRange→5],{n,5}]]

    B.ListAnimate[Table[Graphics[{Disk[{0,0},n],T[[n]]}, PlotRange->5],{n,5}]]

    C.ListAnimate[Table[Graphics[{T[n],Disk[{0,0},n]}, PlotRange→5],{n,5}]]

    D.ListAnimate[Table[Graphics[{Disk[{0,0},n],T[n]}, PlotRange→5],{n,5}]]


    ListAnimate[Table[Graphics[{T[[n]],Disk[{0,0},n]}, PlotRange→5],{n,5}]]

  • 第6题:

    如果要让某个用户能够在所有模式下建表应该授予此用户哪个权限?

    A.create table

    B.create any table

    C.create all table

    D.create * table


    create any table