c- A doctor may treat up to M patients; some doctors may choose not to treat any patient
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1 Name (in Arabic :P): Student ID: Q1) Choose the correct answer: (9 points) 1- If a student can take no more than 6 courses in a semester and the number of students allowed in a course in a semester should not exceed 30 students, then the Student-Course relationship is: a- 6:30 b- 30:6 c- M:6 d- 30:M 2- The following ER diagram is interpreted as follows: a- A doctor must treat up to M patients b- A doctor treats exactly M patients; c- A doctor may treat up to M patients; some doctors may choose not to treat any patient d- A doctor will treat patients based on some conditions 3- The columns of a relation (table): a- may be in any order b- must be in a specific order c- the primary key must be in the first column d- the largest width column must be placed the last one 4- A database is a: a- collection of files b- collection of inputs and outputs of an application c- collection of related data necessary to manage an organization d- collection of tables of different sizes
2 5- An ER model of a given application leads to: a- conceptual data model b- logical data model c- external data model d- internal data model 6- specifies the maximum number of relationship instances that an entity can participate: a- Range b- Domain c- Cardinality d- Data type 7- Data independence allows which of the following: i- No changes in application programs ii- Change in database without affecting application programs iii- Hardware to be changed without affecting application programs iv- System software to be changed without affecting application programs a- i, ii b- ii, iii c- ii, iii, iv d- i, ii, iv
3 8- Among the objectives of a DBMS are to ensure which of the following: i- Data integrity ii- Data redundancy iii- Data security iv- Easy data retrieval a- i, ii b- i, iii c- i, iii, iv d- i, ii, iii 9- The sequence followed in designing a DBMS is: a- physical model conceptual model logical model b- logical model physical model conceptual model c- conceptual model physical model logical model d- conceptual model logical model physical model Answers: B C A C B C C C D
4 Q2) Answer each of the following short questions: (4 points) What does (EERD) stand for? What we call a collection of programs which enable users to create and maintain a database? What is the name of the set of keys from which a primary key can be chosen? Give another name of a table s row? What we call a relationship defined on the same entity with two different rolls? What we call the content of the database in a particular time? What does (DML) stand for? What we call a thing or an object in the ER model? Extended (or Enhanced) Entity-Relationship Diagram Database management system Candidate keys Tuple (or Record) Recursive (or Unary) Instance of the database Data manipulation language An entity
5 Q3) Consider the following ERD and then answer the following questions: (7 points) What we call the attribute skills defined on A? Multivalued attribute What we call the underlined attribute id defined on B? Primary key What we call the attribute address defined on B? Composite attribute What we call date defined on R1? Attribute of the relationship What we call the attribute age defined on C? Derived attribute What we call the entity C (type)? Weak entity What we call the relationship R1 (name)? Ternary What is the degree of the relationship R2? 2 What kind of participation is defined from C through R2? Total (or Mandatory) What would be the primary key of table C? (id, name) What we call the relationship R3 (name)? Recursive (or Unary) What does the letter does the letter d in the circle connected to B Distinct mean? What we call the classification of B into E and F? Specialization What we call the set of possible values that can be assigned to the Domain of name attribute name?
6 Q4) Write a relational schema (map into relations) the following ER diagram. Be certain to indicate primary keys and referential integrity constraints (foreign keys): (7 points)
7 Answer: Dept (dname) Faculty (fid, name, rank, dname) Course (number, dname, title) Class (section#, semester, number, dname, room, schedule, fid) F.K. (number) references Course F.K. (fid) references Faculty can_teach (fid, number, dname) F.K. (fid) references Faculty F.K. (number) references Course taught_by (fid, number, dname, section#, semester, eval) F.K. (fid) references Faculty F.K. (number) references Course F.K. (section#) references Class F.K. (semester) references Class Student (sid, name, standing, fid) F.K. (fid) references Faculty enrolled_in (sid, number, dname, section#, semester, grade) F.K. (sid) references Student F.K. (number) references Course F.K. (section#) references Class F.K. (semester) references Class
8 Q5-A) Use an EER diagram to model the following enterprise problem. Explain all the components through your model indicating entities, attributes, relationships, specialization (if any), cardinalities and other constraints: (6 points) 1- A house is identified by a three-part address consisting of a number, street, and city. Each house also has a style and a set of colors 2- A person is identified by a unique national number. Each person also has a name, date of birth (DoB), age, sex and income 3- Based on a person s income and age, every person must be classified as either a Qualified or Not Qualified person 4- People who are qualified may own zero or more houses, and every house is owned by at least one person 5- Any person, regardless of age and income, lives in at most one house as his/her residence, and a house can have zero or more people living there Q5-B) Write SQL create statement for the table House (2 points)
9 Answer: Q5-A)
10 Q5-B) Create table House ( Number int, Street string, City string, Style string, Primary key (Number, Street, City) ); Every day and night; Just believe in God. دعواتكم بالخیر
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