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OCP Questions [message #133266]

Thu, 18 August 2005 05:32

nirmalnarayan
Messages: 261
Registered: April 2005
Location: India

Senior Member

Hi,

I found these questions in the forum.

Question No. 01: Which clause excludes the group function?
a. WHERE
b. FROM
c. HAVING
d. GROUP BY
e. ORDER BY

Question No. 02: Select ROUND (TRUNC (MOD (1600, 10), -1), 2) from dual;
a. 0
b. 0.00
c. Error

Can any one help me with answers and explanations ?

Thanks and Regards,
Nirmal N

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Re: OCP Questions [message #134496 is a reply to message #133266]

Thu, 25 August 2005 04:50

nileshmanav
Messages: 1
Registered: August 2005
Location: Chennai

Junior Member

the answer of 1st question is "where" and for 2nd question is "0"

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Re: OCP Questions [message #134835 is a reply to message #133266]

Sat, 27 August 2005 15:50

Michael Hartley
Messages: 110
Registered: December 2004
Location: West Yorkshire, United Ki...

Senior Member

1.e. because you can't orderby after applying a groupby,or you can't groupby after orderby. Groupby defines the columns that are not summed in the select list
eg.

select col1, col2, count(*)
from table
where col3='somevalue'
groupby col1, col2;

In other words, for each distinct col1, col2 tuple find the count of the occurances of this tupple.

2.c I think trunc(x,-1) would fail with an error because -1 is incorrectly identifying a number of decimal places.

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Re: OCP Questions [message #134848 is a reply to message #134835]

Sun, 28 August 2005 03:02

tarundua
Messages: 1080
Registered: June 2005
Location: India

Senior Member

I think u got the answer for the first question and the second is 0 cos ---

SQL> select mod(1600,10) from dual;

MOD(1600,10)
------------
0

applying a function on 0 returns 0.

and

Quote:

trunc(x,-1) would fail with an error

It is not so ..

SQL> select trunc(545,1) from dual;

TRUNC(545,1)
------------
545

SQL> select trunc(545,-1) from dual;

TRUNC(545,-1)
-------------
540

SQL> select trunc(545,-2) from dual;

TRUNC(545,-2)
-------------
500

Now i think the picture is clear.

regards,
tarun

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