Final_Exam_Semester_1.docx

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Final Exam Semester 1

Review your answers, feedback, and question scores below. An asterisk (*) indicates a correct answer.

Section 11

(Answer all questions in this section)

1. An "Arc Imlementation" can be done !ust like any other Relationshi yousimly add the required #orei$n %eys. &rue or #alse'

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&rue

#alse (*)

+orrect

2. In a hysical data model, a relationshi is reresented as a combination of(+hoose &wo)

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(+hoose all correct answers)

+olumn

rimary %ey or -nique %ey (*)

+heck +onstraint or -nique %ey

#orei$n %ey (*)

+orrect

3. In a hysical data model, an attribute becomes a . ark for

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&able

#orei$n %ey

+onstraint

+olumn (*)

+orrect

4. &he transformation from an /R dia$ram to a hysical desi$n involveschan$in$ terminolo$y. 0econdary -nique Identi1ers become

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+olumns

&ables

-nique +onstraints (*)

rimary %ey +onstraints

+orrect

5. &he te2t below is an e2amle of what constraint tye'

&he value in the mana$erid column of the /345//0 table must match avalue in the emloyeeid column in the /345//0 table.

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/ntity inte$rity

-serde1ned inte$rity

+olumn inte$rity

Referential inte$rity (*)

+orrect

6. #orei$n keys must be null. &rue or #alse' ark for

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&rue

#alse (*)

+orrect

7. &he e2lanation below is a column inte$rity constraint. &rue or #alse'

A column must contain only values consistent with the de1ned data formatof the column.

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&rue (*)

#alse

+orrect


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8. If a rimary key is a set of columns, then one column must be null. &rue or#alse'

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&rue

#alse (*)

+orrect

9. &he te2t below is an e2amle of what constraint tye'

If the number of 644%0 lent to a 64RR47/R in the 3I6RAR5 e2ceeds 8,then we must send him a letter requestin$ the return of the 644%09 this willrequire e2tra ro$rammin$ to enforce.

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/ntity inte$rity-serde1ned inte$rity (*)

+olumn inte$rity

Referential inte$rity

+orrect

10. 4neto4ne relationshis are transformed into +heck +onstraints in thetables created at either end of that relationshi. &rue or #alse'

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&rue

#alse (*)

+orrect

11. In a concetualmodel, manytomanyrelationshis areresolved via astructure calleda:an

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0uertye

Intersection &able

Intersection /ntity (*)

0ubtye


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+orrect

Section 12


12. 0ystem ;ocumentation is develoed ri$ht at the end oncethe system has $one live and users have been usin$ it for alittle while. 5ou are more likely to $et it correct that way. &rueor #alse'

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&rue

#alse (*)

+orrect.

13. 0ystems are always !ust rolled out as soon as thero$rammin$ hase is 1nished.


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15. &he 0C3 statement A3&/R &A63/ /345//0 ;/3/&/+43-< 0A3AR5 is a valid statement. &rue or #alse'

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&rue

#alse (*)

+orrect.

16. &he clause can be added to a 0/3/+& statement toreturn a subset of the data.

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A


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Section 15


19. In a 0/3/+& clause, what is the result of @ E B * @' ark for

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F

G (*)

B

+orrect.

20. If a 0C3 statement returns data from two or more tables,which 0C3 caability is bein$ used'

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0election

ro!ection

Hoinin$ (*)

Insertion

+orrect.

Section 15


21. 5ou query the database with this 0C3 statement0/3/+& * #R4 students9

7hy would you use this statement'

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&o insert data

&o view data (*)

&o dislay the table structure

&o delete data

+orrect.


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22. &he /345//0 table contains these columns

0A3AR5


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ultilications and ;ivisions are at the same level and would beevaluated 1rst based on left to ri$ht order (*)Additions and ultilications are at the same level and would beevaluated 1rst based on left to ri$ht order;ivisions and 0ubtractions are at the same level and would beevaluated 1rst based on left to ri$ht order

+orrect.

Section 16


25. &he /345//0 table contains these columns

3A0&


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(*)

0/3/+& lastname, 1rstname, hiredate#R4 emloyees7=/R/ hiredate 6/&7//< MBA-P@M A? MB A-P@M90/3/+& lastname, 1rstname, hiredate#R4 emloyeesA? MBA-P@M9

+orrect.

27. 5ou need write a 0/3/+& statement that should only return rows thatcontain BO, OF, or OG for the ;/AR&/


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0/3/+& lastname, deartmentid#R4 emloyees7=/R/ emloyeeid equals F90/3/+& 1rstname, emloyeeid#R4 emloyees7=/R/ emloyeeid ? F90/3/+& lastname, emloyeeid

#R4 emloyees7=/R/ emloyeeid equals F9

+orrect.

29. 5ou want to retrieve a list of customers whose last names be$in with theletters M#rM . 7hich keyword should you include in the 7=/R/ clause of your0/3/+& statement to achieve the desired result'

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A


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12/17

+orrect.

35. 5ou need to combine the #IR0&


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@8 (*)

@8 (*)

+orrect.

38. /valuate this 0/3/+& statement

0/3/+& emloyeeid, lastname, 1rstname, salary M5early 0alaryM#R4 emloyees7=/R/ salary I0


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&he database will dislay the rows in whatever order it 1nds it in thedatabase, so no articular order. (*) &he results will be sorted ascendin$ by the 3A0&


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&here is no diKerence in the result between the two statements.

&he statements will sort on diKerent column values. (*)

IncorrectN 0ee 0ection 3esson B.

43. /valuate this 0C3 statement

0/3/+& e.emloyeeid, e.lastname, e.1rstname, m.mana$erid#R4 emloyees e, emloyees m4R;/R 65 e.lastname, e.1rstname7=/R/ e.emloyeeid ? m.mana$erid9

&his statement fails when e2ecuted. 7hich chan$e will correct the roblem'

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Reorder the clauses in the query. (*)

Remove the table aliases in the 7=/R/ clause.

Remove the table aliases in the 4R;/R 65 clause.

Include a =ADI


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4R;/R 65 lastname, 1rstname90/3/+& lastname, 1rstname#R4 layers7=/R/ ositionid Q? F4R;/R 65 lastname ;/0+, 1rstname9

+orrect.

45. 7hich clause would you include in a 0/3/+& statement to sort the rowsreturned by the 3A0&


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48. 7hich of the followin$ best describes the meanin$ of the 3I%/ oerator' ark for

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;islay rows based on a ran$e of values.

&o test for values in a list.

atch a character attern. (*)

&o 1nd

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