IS 410 Final Study Guide Questions and Correct Answers/ Latest Update / Already Graded

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IS 410 Final Study Guide Questions and
Correct Answers/ Latest Update / Already
Graded
Identify the capabilities of SELECT statement.

A. Projection

B. Selection

C. Data Control

D. Transaction

Ans: A & B. The SELECT statement can be used for selection,
projection and joining.


2. Determine the capability of the SELECT statement demonstrated in
the given query.

SELECT e.ename, d.dname

FROM emp e, dept d

WHERE e.deptno = d.deptno

AND e.sal > 1000;



A. Selection

B. Filtering

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C. Joining

D. Projection

Ans: A, C, D. Projection is including only the required columns
in query, while Selection is selecting only the required data.
Joining means combining two tables together through a
connecting column.


Which of the following clause is used to suppress duplicates in a
SELECT statement?



A. INTERSECT

B. DUPLICATE

C. DISTINCT

D. UNIQUE

Ans: C, D. Duplicate data can be restricted with the use of
DISTINCT or UNIQUE in the SELECT statement.


Determine the output of the below query -

SELECT '5+7'

FROM dual;



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A. 12

B. 5+7

C. 5

D. 7

Ans: B, Oracle treats the values within double quotes as string
expressions.


Chose the statements which correctly define a NULL value.



A. NULL is a special value with zero bytes

B. NULL is no value or unknown value

C. NULL is represented by a blank space

D. NULL is not same as zero

Ans: B & D. NULL is NO VALUE but neither same as zero nor as
blank or space character.


What is true about data types in Oracle DB?



A. They are given to columns for sorting purposes.

B. They are given to columns for a structured representation in a table.

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