please answer these true and false answers. And please take the time in sake of

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please answer these true and false answers. And please take the time in sake of correctness.
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LPTER 2: DATA MoDELS (True or False). Circle the correct answer (2 each 40 points) A data model is usually graphical. a. True b, False 2. An implementation-ready data model needn't necessarily contain enforceable rules to guarantee the integrity of a. True 3, b. False structure will store the end An implementation-ready data model should contain a description of the data that user data. a. True 4. b. False the purpose of supporting a Within the database environment, a data model represents data structures with specific problem domain. a. True 5. b. False good the end user. Even when a that of the manager and database blueprint is available, an applications programmer's view of the data should match a. True 6. b. False person. place, thing, or event about which data will be collected and In the context of data models, an entity is a stored. a. True 7. b. False information that yield the required understanding of the entire Database designers determine the data and a. True b, False etbe, oforoanizations such as

Explanation / Answer

1) True

Data models are specified in a process used to define and analyze data requirements which graphical in form

2) False

data models job is to guarantee the integrity of the data

3) True

which is helpful to describe the data model

4) True

Data Structures were implemented to address the problems of data handling.

5) False

Applications programmer who needs to understand or implement database which is used to make it simple to manage to end user.

6)True

An entity in database is like Object, which could be person, place etc.. anything that we can describe with unique identification.

7) False

Designers need not to know about business, they gather only requirements

8) False

business rules can be applicable to any types.

9) True

they specific to application or problem, so predefined may not healpful.

10) False

End user may not have idea about RDBS structure.

11) False.

There may some independent tables also available, example I have Collage schema where it contained student, lecturer, courses offered tables and college_history table present, here first three are dependent on each other whereas history table is independent.

12) True

yes otherwise data mismatch may happen,

Employee table contains department_id and department table contain department_id depending upon these two columns a relation will present between employee and department tables.

13) True

Each row of table is a make sense about that particular table

14) True

proper relationships may be M:M

15) False

it can be vertical or horizontal

16) True

It will be easy to handle reduces confusions

17) True

yes, it is as network level relations can made between data models or schemas

18) False

external model is may be a requirement.

19) False

it is depending upon the RDBS what we choose

20) False

depending upon the RDBS software what we choose.

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