执行如下两个查询,结果为() Select ename name,sal salary from emp order by salary Select ename name,sal“salary”from emp order by sal asc
第1题:
职员关系模式为E(Eno,Ename,Dept,Eage,Eaddr)。其中,Eno表示职员号,Ename表示职员名,Dept表示职员所在部门,Eage表示年龄,Eaddr表示职员的家庭住址。建立“开发部”(DS表示开发部)职员的视图DS_E如下,要求进行修改、插入操作时保证该视图只有开发部的职员。
CREATE VIEW DS_E
AS SELECT Eno,Ename,Dept,Eage,Eaddr
FROM E
WHERE(47);
如下SQL语句可以查询开发部姓“王”职员的姓名和家庭住址。
Select Ename, Eaddr
From DS_E
Where(48);
A.Dept=DS
B.Dept=DS WITH CHECK OPTION
C.Dept='DS'
D.Dept='DS' WITH CHECK OPTION
第2题:
The EMP table has these columns:ENAME VARCHAR2(35)SALARY NUMBER(8,2)HIRE_DATE DATEManagement wants a list of names of employees who have been with the company for more than five years. Which SQL statement displays the required results? ()
A. SELECT ENAME FROM EMP WHERE SYSDATE-HIRE_DATE >5;
B. SELECT ENAME FROM EMP WHERE HIRE_DATE-SYSDATE >5;
C. SELECT ENAME FROM EMP WHERE (SYSDATE_HIRE_DATE)/365 >5;
D. SELECT ENAME FROM EMP WHERE (SYSDATE_HIRE_DATE)*/365 >5;
第3题:
A.IN
B.BETWEEN……and
C.LIKE
D.<=
第4题:
已知成绩关系如下图所示。执行SQL语句:SELECT COUNT (DISTINCT 学号)FROM 成绩WHERE 分数>60查询结果中包含的元组数目是成绩学号 课程号 分数
A.1
B.2
C.3
D.4
第5题:
可以将两个SELECT语句的查询结果通过并运算合并成一个查询结果,需用子句______。
A.WHERE
B.UNION
C.ORDER BY
D.JOIN
第6题:
Evaluate this SQL statement:SELECT ename, sal, 12* sal+100 FROM emp;The SAL column stores the monthly salary of the employee. Which change must be made to the abovesyntax to calculate the annual compensation as "monthly salary plus a monthly bonus of $100, multiplied by 12"? ()
A. No change is required to achieve the desired results.
B. SELECT ename, sal, 12* (sal+100) FROM emp;
C. SELECT ename, sal, (12* sal)+100 FROM emp;
D. SELECT ename, sal +100,*12 FROM emp;
第7题:
已知成绩关系如下图所示。执行SQL语句:
SELECT COUNT(DISTINCT 学号)
FROM成绩
WHERE分数>60
查询结果中包含的元组数目是
A.1
B.2
C.3
D.4
第8题:
A.select employeesno,ename Name,job from employees where ename=‘SMITH’
B.select employeesno,ename ‘Name’,job from employees where ename=SMITH
C.select employeesno,ename “Name”,job from employees where ename=‘SMITH’
D.select employeesno,ename ‘Name’,job frome mployees wheree name=‘SMITH’
第9题:
右商品表内容如下:执行SQL命令:SELECT部门号,MAX(单价*数量)FROM商品表GROUP BY部门号;查询结果的记录是( )。
A.1
B.3
C.4
D.10
第10题:
对于第7题的两个基本表,有一个SQL语句: SELECT ENO, ENAME FROM EMP WHERE DNO NOT IN (SELECT DNO FROM DEPT WHERE DNAME='金工车间');其等价的关系代数表达式是:______。
A.πENO,ENAME(σDNAME≠'金工车间'(EMPDEPT))
B.πENO,ENAME
C.πENO,ENAME(EMP)-πENO,ENAME (σDNAME='金工车间'(EMPDEPT))
D.πENO,ENAME (EMP)-πENO,ENAME (σDNAME≠'金工车间'(EMPDEPT))