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# Quize # 02 of spring 2012

Plz share ur Quizes!!!!!!!!!!!!!!!!

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### Replies to This Discussion

1- Unary Operation involve
Ans = one Operation only

2- Binary relationships are those, which are established between
Ans = Two operation only

3- If A -> B and A -> C, then A -> BC The Inference Rule applies is
Ans Argumentation

4- multivalued attribute are
Ans Bank account Balance

5- In “One to Many” cardinality one instance of a relation is mapped with One instance of second entity type
Ans Second Entity Type

6- Which of the following might be represented with a single-valued attribute
Ans computer's processor speed

7- Relational Calculus is a _____________ relational data manipulation language
Ans I dont know Confirm answer of that i put procedural and formal

8- In an ERD, the focus is on the ____ and the relationships between them.
Ans Entites (NOt Sure for that)

Equi-join is similar to _________ with slight difference.

Ans. Natural Join

3- If A -> B and A -> C, then A -> BC The Inference Rule applies is

Cs403 - Quiz No.2 May 3, 2012 by Funkar and this team.

Attachments:

Thanxxxxxxxx syed M.umair saulat....

Syed M. Umair Saulat gud keep it up

i have opjection on question number three its not augmentation rule it is additivity or union rule of inference.

reference= handouts page number 160

non- procedural formal

reference= 155 page

Thanks HAYA g for correction of this file....

Nabila Rehman gud keep it up

apke question number 2 pe doubt hai mujeh for reference page number= 80

i think it will be false many men ik instance link nahi krta

Many-to-Many mapping: A mapping R from X to Y is many-to-many if each entity from X is associated with many entities in Y and one entity in Y is associated with many entities in X.

it will be two or more than two it cant be 1 .... for reference page number = 80

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