Primary Key: A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table. Example: Students in Universities are assigned a unique registration number. Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key. Foreign Key: Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table. Example: In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table. Many-to-One relationship: When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship. One-to-Many Relationship: When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship. One-to-One relationship: When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship. ENTITY- RELATIONSHIP DIAGRAM (ERD): Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes. CROW FOOT ERD: The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database. Given database tables: Table Name: EMPLOYEE EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE 1 Mr. Williamson John W 21-May-84 3 2 Ms. Ratula Nancy 09-Feb-89 2 3 Ms. Greenboro Lottie R 02-Oct-81 4 4 Mrs. Rumpersfro Jennie S 01-Jun-71 5 5 Mr. Smith Robert L 23-Nov-59 3 6 Mr. Renselear Cary A 25-Dec-85 1 7 Mr. Ogallo Roberto S 31-Jul-82 3 8 Ms. Johnson Elizabeth I 10-Sep-88 1 9 Mr. Eindsmar Jack W 19-Apr-55 2 10 Mrs. Jones Rose R 06-Mar-66 4 11 Mr. Broderick Tom 21-Oct-72 3 12 Mr. Washington Alan Y 08-Sept-74 2 13 Mr. Smith Peter N 25-Aug-64 3 14 Ms. Smith Sherry H 25-May-66 4 15 Mr. Olenko Howard U 24-May-64 5 16 Mr. Archialo Barry V 03-Sep-60 5 17 Ms. Grimaldo Jeanine K 12-Nov-70 4 18 Mr. Rosenburg Andrew D 24-Jan-71 4 19 Mr. Rosten Peter F 03-Oct-68 4 20 Mr. Mckee Robert S 06-Mar-70 1 21 Ms. Baumann Jennifer A 11-Dec-74 3 Table Name: STORE STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE 1 Access Junction 1003455.76 2 8 2 Database Corner 1421987.39 2 12 3 Tuple Charge 986783.22 1 7 4 Attribute Alley 944568.56 2 3 5 Primary Key Point 2930098.45 1 15

Question

create table queries using sinplified sales table 1. Which manufacturers are located in the city of New York? Show the manufacturer's name, state, postal code, and contact person. 2. Show product information for white shoes in the 'sneakers' category that cost more than $50 and have a product description that begins with the letter "b" or "t". Show only the product name, its composition, and its list price. 3. Show the product name, description, and category for all shoes with a list price of $150 or more and in one of the following categories: sneakers, boots, or sandals. Order the output alphabetically by product name. 4. How many customers do we have with a last name starting with a 'Q' living in each city? Your query should display two columns, one named cust_num and one named city. Sort the results alphabeticaly by city. 5. Show the product name, list price, customer state (call it 'CustState'), and manufacturer state (call it 'ManState') for all products made by manufacturers in…

Answer 1

Question

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

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create table queries using sinplified sales table 1. Which manufacturers are located in the city of New York? Show the manufacturer's name, state, postal code, and contact person. 2. Show product information for white shoes in the 'sneakers' category that cost more than $50 and have a product description that begins with the letter "b" or "t". Show only the product name, its composition, and its list price. 3. Show the product name, description, and category for all shoes with a list price of $150 or more and in one of the following categories: sneakers, boots, or sandals. Order the output alphabetically by product name. 4. How many customers do we have with a last name starting with a 'Q' living in each city? Your query should display two columns, one named cust_num and one named city. Sort the results alphabeticaly by city. 5. Show the product name, list price, customer state (call it 'CustState'), and manufacturer state (call it 'ManState') for all products made by manufacturers in…

Select the best answer from the given choices: Using the company schema, when creating the "works_on" table, the primary key should be specified as All of the answers are correct primary key (essn, pno) primary key (essn), primary key(pno) primary key (essn) and primary key(pno)

Please answer my questions

Answer 2

Question

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

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Answer 3

Question

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

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Answer 4

Question

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

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Answer 5

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

Answer 6

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

Answer 7

Chapter 3, Problem 8P

Program Plan Intro

Primary Key:

A Primary Key in a database table is a field in the table that uniquely identifies every row or record present in the database table.

Example:

Students in Universities are assigned a unique registration number.

Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.

Foreign Key:

Foreign Key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.

Example:

In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.

Many-to-One relationship:

When one record in a database table is associated with one or more records in another table, the relationship between the two tables is referred as many-to-one relationship. It is also represented as M: 1 relationship.

One-to-Many Relationship:

When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one-to-many relationship. It is also represented as1: M relationship. This is the opposite of many to one relationship.

One-to-One relationship:

When one record in a database table is associated with one and only one record in another table, the relationship between the two tables is referred as one-to-one relationship. It is also represented as1: 1 relationship.

ENTITY- RELATIONSHIP DIAGRAM (ERD):

Entity- Relationship Diagram is also known as ER Diagram. It is used to define the conceptual view of the database as viewed by the end user. It is used to depict the database’s main components: entities, relationships and attributes.

CROW FOOT ERD:

The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.

Given database tables:

Table Name: EMPLOYEE

EMP_CODE EMP_TITLE EMP_LNAME EMP_FNAME EMP_INITIAL EMP_DOB STORE_CODE

1 Mr. Williamson John W 21-May-84 3

2 Ms. Ratula Nancy 09-Feb-89 2

3 Ms. Greenboro Lottie R 02-Oct-81 4

4 Mrs. Rumpersfro Jennie S 01-Jun-71 5

5 Mr. Smith Robert L 23-Nov-59 3

6 Mr. Renselear Cary A 25-Dec-85 1

7 Mr. Ogallo Roberto S 31-Jul-82 3

8 Ms. Johnson Elizabeth I 10-Sep-88 1

9 Mr. Eindsmar Jack W 19-Apr-55 2

10 Mrs. Jones Rose R 06-Mar-66 4

11 Mr. Broderick Tom 21-Oct-72 3

12 Mr. Washington Alan Y 08-Sept-74 2

13 Mr. Smith Peter N 25-Aug-64 3

14 Ms. Smith Sherry H 25-May-66 4

15 Mr. Olenko Howard U 24-May-64 5

16 Mr. Archialo Barry V 03-Sep-60 5

17 Ms. Grimaldo Jeanine K 12-Nov-70 4

18 Mr. Rosenburg Andrew D 24-Jan-71 4

19 Mr. Rosten Peter F 03-Oct-68 4

20 Mr. Mckee Robert S 06-Mar-70 1

21 Ms. Baumann Jennifer A 11-Dec-74 3

Table Name: STORE

STORE_CODE STORE_NAME STORE_YTD_SALES REGION_CODE EMP_CODE

1 Access Junction 1003455.76 2 8

2 Database Corner 1421987.39 2 12

3 Tuple Charge 986783.22 1 7

4 Attribute Alley 944568.56 2 3

5 Primary Key Point 2930098.45 1 15

Answer 8

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Ch. 3 - What is the difference between a database and a...Ch. 3 - Prob. 2RQ Ch. 3 - Prob. 3RQ Ch. 3 - What are the requirements that two relations must...Ch. 3 - Which relational algebra operators can be applied...Ch. 3 - Explain why the data dictionary is sometimes...Ch. 3 - A database user manually notes that The file...Ch. 3 - Prob. 8RQ Ch. 3 - Prob. 9RQ Ch. 3 - Prob. 10RQ

Solution Summary: The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram.

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Chapter 3 Solutions

EMP_CODE	EMP_TITLE	EMP_LNAME	EMP_FNAME	EMP_INITIAL	EMP_DOB	STORE_CODE
1	Mr.	Williamson	John	W	21-May-84	3
2	Ms.	Ratula	Nancy		09-Feb-89	2
3	Ms.	Greenboro	Lottie	R	02-Oct-81	4
4	Mrs.	Rumpersfro	Jennie	S	01-Jun-71	5
5	Mr.	Smith	Robert	L	23-Nov-59	3
6	Mr.	Renselear	Cary	A	25-Dec-85	1
7	Mr.	Ogallo	Roberto	S	31-Jul-82	3
8	Ms.	Johnson	Elizabeth	I	10-Sep-88	1
9	Mr.	Eindsmar	Jack	W	19-Apr-55	2
10	Mrs.	Jones	Rose	R	06-Mar-66	4
11	Mr.	Broderick	Tom		21-Oct-72	3
12	Mr.	Washington	Alan	Y	08-Sept-74	2
13	Mr.	Smith	Peter	N	25-Aug-64	3
14	Ms.	Smith	Sherry	H	25-May-66	4
15	Mr.	Olenko	Howard	U	24-May-64	5
16	Mr.	Archialo	Barry	V	03-Sep-60	5
17	Ms.	Grimaldo	Jeanine	K	12-Nov-70	4
18	Mr.	Rosenburg	Andrew	D	24-Jan-71	4
19	Mr.	Rosten	Peter	F	03-Oct-68	4
20	Mr.	Mckee	Robert	S	06-Mar-70	1
21	Ms.	Baumann	Jennifer	A	11-Dec-74	3

STORE_CODE	STORE_NAME	STORE_YTD_SALES	REGION_CODE	EMP_CODE
1	Access Junction	1003455.76	2	8
2	Database Corner	1421987.39	2	12
3	Tuple Charge	986783.22	1	7
4	Attribute Alley	944568.56	2	3
5	Primary Key Point	2930098.45	1	15