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Database Management System Question

Database Management System Question With Answer & Solution

Que. - DML changes are

(A) insert

(B) update

(D) both insert and update

Que. - Which of the following object types below cannot be replicated?

(A) data

(B) trigger

(D) sequence

Que. - How to force a log switch?

(A) by using alter system log

(B) by using alter system switch logfile

(D) by using alter sys logfiles

Que. - The ORDER BY clause can only be used in

(A) select queries

(B) insert queries

(D) having queries

Que. - Which of the following rule below are categories of an index?

(A) column and functional

(B) multiple column and functional

(D) none of the mentioned

Que. - Which of the following queries are legal?

(A) select deptno, count(deptno) from emp group by ename;

(B) select deptno, count(deptno), job from emp group by deptno;

(D) select deptno, avg(sal) from emp group by deptno;

Que. - Which of the following queries displays the sum of all employee salaries for those employees not making commission, for each job, including only those sums greater than 2500?

(A) select job, sum(sal) from emp where sum(sal) > 2500 and comm is null;

(B) select job, sum(sal) from emp where comm is null group by job having sum(sal) > 2500;

(D) select job, sum(sal) from emp group by job having sum(sal) > 2500 and comm is not null;

Que. - Which of the following data structure is not linear data structure?

(A) arrays

(B) linked lists

(D) none of the mentioned

Que. - Which of the following data structure is linear data structure?

(A) trees

(B) graphs

(D) none of the mentioned

Que. - The operation of processing each element in the list is known as

(A) sorting

(B) merging

(D) traversal

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