ER to Relational Conversion: Which of the following kind of attribute in an entity set results...
ER to Relational Conversion: Which of the following kind of
attribute in an entity set results in the creation of a table
separate from the table for the entity set itself?
A. Simple Attribute
B. Composite Attribute
C. Multi-valued Attribute
D. Derived Attribute
Homework Answers
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ER to Relational Conversion: Which of the following kind of
attribute in an entity set results...
1. Please answer the following questions. You need to draw ER diagrams using any free tools...
1. Please answer the following questions. You need to draw ER diagrams using any free tools discussed in the class or you may draw using pencil and paper. Please identify the entities and relationships between them. For each entity, please identify the attributes each entity has. For each attribute, please identify whether this attribute is optional or required, single valued or multi-valued, simple or composite, stored or derived. Define a key (identifier) for each entity. Note that a key can...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
Which of the following describes referential integrity? A. A Primary Key of a relational table must...
Which of the following describes referential integrity? A. A Primary Key of a relational table must not contain a null value B. One fact must not be in multiple places C. The value for a foreign key attribute must either be null or match the one of the data value of that attribute in the table in which the attribute is a primary key D. Referential Integrity is a principle that prevents the use of redundancy, avoids null values and...
Part 32 Tramdlatian Madl eal es Point) Question 3.2.1 (35 Points) Take the following ER-model and...
Part 32 Tramdlatian Madl eal es Point) Question 3.2.1 (35 Points) Take the following ER-model and translate it into a relational schema using the rules presented in class. Present the relational schema as an SQL script (assume that all attributes are of data type INT). Present the results of the following intermediate steps in this order: 1. Translate strong entities + unnest composite attributes 2. Translate weak entities 3. Translated multi-valued attributes 4. Translate relationships as 011 A. 0:N 012...
A Pages entity in a relational database for tracking web browsing has the following attributes: PageID (the primary key, an integer number, required), PageURL (text, maximum 255 characters, required),...
A Pages entity in a relational database for tracking web browsing has the following attributes: PageID (the primary key, an integer number, required), PageURL (text, maximum 255 characters, required), IPAddress (text, maximum 15 characters, required), ViewDateTime (date and time the page was viewed, required). (a) Write an SQL Data Definition Language command to create the table for this entity. (b) Write an SQL Data Definition Language command to add a column for a new attribute to this table: ViewDuration (duration...
24) A key that contains more than one attribute is called a(n) A) composite key B)...
24) A key that contains more than one attribute is called a(n) A) composite key B) complex key C) multi-key D) n-key E) candidate key 25) Null values can cause problems because they are ambiguous. True False 26) In the normalization process, it is necessary to identify all the determinants in a relation. True False 27) To represent a relationship in the relational model, the primary key of one relation is placed into a second relation. True False 28) A...
The following relational schema is given for a Pokemon Database: Pokemon (PID, PName) Type (TID, TName)...
The following relational schema is given for a Pokemon Database: Pokemon (PID, PName) Type (TID, TName) Trainer (SSN, Name, Surname) InType (PID, TID) StrongAgainst (TID_Strong, TID_Weak) Owns (SSN, PID, Nickname, Level, Height, Weight, Catch_Date) SpecializedIn (SSN, TID) In this database, Pokemon (Imaginary creatures, short for “Pocket Monsters”) are stored in the entity set Pokemon, with a unique PID and PName. Pokemon types are stored in the entity set Type, with a unique TID and TName. Pokemon trainers are stored in...
Consider the relational schemas given below and the respective sets of functional dependencies va...
Write the complete proof.
Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas For each one of the relational schemas, determine the highest normal form, which is valid for a schema. Justify your answer If a schema is not in BCNF, then decompose it into a minimum number of schemas so that each one of them is in BCNF. Justify your answers. Justification must include the derivations of minimal keys from the...
6. With respect to database systems, which of the following statement(s) is (are) true? a. The...
6. With respect to database systems, which of the following statement(s) is (are) true? a. The physical view of data is how people conceptually organize and understand the relationships among data items. b. The DML builds the data dictionary, creates the database, describes logical views for each user, and specifies security constraints. c. A record layout shows the items stored in a file, including the type of data stored and both the order and length of the data fields. d....
31. What kind of reaction does the conversion of A to B represent? A) Addition reaction....
31. What kind of reaction does the conversion of A to B represent? A) Addition reaction. B) Substitution reaction. C) Elimination reaction. D) Acid-base reaction 32. What kind of reaction does the conversion of A to B represent? H2SO. + HO нон A) Addition reaction B) Elimination reaction C) Substitution reaction D) Oxidation-reduction reaction. 33. Which of the following statements about addition reactions is true? A) Two a bonds are formed. B) Two bonds are broken C) Two o bonds...
QUESTION 1 What is the most common relationship within a relational database? Select the best answer from the following. One-To-One relationship. o One-To-Many relationship. Many-To-Many relationship. Zero-To-Zero relationship. QUESTION 2 What is an "entity'? Select the best answer from the following. An entity, for our purposes, is the same as a table in the database. An entity represents one of the columns in an individual table. There are no entities in a relational database. Entities are only part of NoSQL...
Part 32 Tramdlatian Madl eal es Point) Question 3.2.1 (35 Points) Take the following ER-model and translate it into a relational schema using the rules presented in class. Present the relational schema as an SQL script (assume that all attributes are of data type INT). Present the results of the following intermediate steps in this order: 1. Translate strong entities + unnest composite attributes 2. Translate weak entities 3. Translated multi-valued attributes 4. Translate relationships as 011 A. 0:N 012...
24) A key that contains more than one attribute is called a(n) A) composite key B) complex key C) multi-key D) n-key E) candidate key 25) Null values can cause problems because they are ambiguous. True False 26) In the normalization process, it is necessary to identify all the determinants in a relation. True False 27) To represent a relationship in the relational model, the primary key of one relation is placed into a second relation. True False 28) A...
Write the complete proof.
Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas For each one of the relational schemas, determine the highest normal form, which is valid for a schema. Justify your answer If a schema is not in BCNF, then decompose it into a minimum number of schemas so that each one of them is in BCNF. Justify your answers. Justification must include the derivations of minimal keys from the...
6. With respect to database systems, which of the following statement(s) is (are) true? a. The physical view of data is how people conceptually organize and understand the relationships among data items. b. The DML builds the data dictionary, creates the database, describes logical views for each user, and specifies security constraints. c. A record layout shows the items stored in a file, including the type of data stored and both the order and length of the data fields. d....
31. What kind of reaction does the conversion of A to B represent? A) Addition reaction. B) Substitution reaction. C) Elimination reaction. D) Acid-base reaction 32. What kind of reaction does the conversion of A to B represent? H2SO. + HO нон A) Addition reaction B) Elimination reaction C) Substitution reaction D) Oxidation-reduction reaction. 33. Which of the following statements about addition reactions is true? A) Two a bonds are formed. B) Two bonds are broken C) Two o bonds...
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