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. 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 Table Name: REGION REGION_CODE REGION_DESCRIPT 1 EAST 2 WEST

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Answer 1

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Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

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Last Chance Securities The IT director opened the department staff meeting today by saying, "I've got some good news and some bad news. The good news is that management approved the payroll system project this morning. The new system will reduce clerical time and errors, improve morale in the payroll department, and avoid possible fines and penalties for noncompliance. The bad news is that the system must be installed by January 1st in order to meet new federal reporting rules, all expenses from now on must be approved in advance, the system should have a modular design if possible, and the vice president of finance would like to announce the new system in a year-end report if it is ready by mid-December." Tasks 1. Why is it important to define the project scope? How would you define the scope of the payroll project in this case? 2. Review each constraint and identify its characteristics: present versus future, internal versus exter- nal, and mandatory versus desirable. 3. What…

2. Signed Integers Unsigned binary numbers work for natural numbers, but many calculations use negative numbers as well. To deal with this, a number of different methods have been used to represent signed numbers, but we will focus on two's complement, as it is the standard solution for representing signed integers. 2.1 Two's complement • Most significant bit has a negative value, all others are positive. So, the value of an n-digit -2 two's complement number can be written as: Σ2 2¹ di 2n-1 dn • Otherwise exactly the same as unsigned integers. i=0 - • A neat trick for flipping the sign of a two's complement number: flip all the bits (0 becomes 1, or 1 becomes 0) and then add 1 to the least significant bit. • Addition is exactly the same as with an unsigned number. 2.2 Exercises For questions 1-3, answer each one for the case of a two's complement number and an unsigned number, indicating if it cannot be answered with a specific representation. 1. (15 pts) What is the largest integer…

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Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

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Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

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Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

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Answer 7

Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

Answer 8

Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

Answer 9

Chapter 3, Problem 1P

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.

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

Table Name: REGION

REGION_CODE REGION_DESCRIPT

1 EAST

2 WEST

Answer 10

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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

Concept explainers

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