[SOLVED] Global Computer Solutions (GCS) is an information

Global Computer Solutions (GCS) is an information technology consulting company with many offices located throughout the United States. The company’s success is based on its ability to maximize its resources—that is, its ability to match highly skilled employees with projects according to region. To better manage its projects, GCS has contacted you to design a database so that GCS managers can keep track of their customers, employees, projects, project schedules, assignments, and invoices.
The GCS database must support all of GCS’s operations and information requirements. A basic description of the main entities follows:
• The employees working for GCS have an employee ID, an employee last name, a middle initial, a first name, a region, and a date of hire.
• Valid regions are as follows: Northwest (NW), Southwest (SW), Midwest North (MN), Midwest South (MS), Northeast (NE), and Southeast (SE).
• Each employee has many skills, and many employees have the same skill.
• Each skill has a skill ID, description, and rate of pay. Valid skills are as follows: data entry I, data entry II, systems analyst I, systems analyst II, database designer I, database designer II, Cobol I, Cobol II, C++ I, C++ II, VB I, VB II, ColdFusion I, ColdFusion II, ASP I, ASP II, Oracle DBA, MS SQL Server DBA, network engineer I, network engineer II, web administrator, technical writer, and project manager. Table P5.11a shows an example of the Skills Inventory.

Table P5.11a Skills Inventory

Skill
Employee

Data Entry I
Seaton Amy; Williams Josh; Underwood Trish

Data Entry II
Williams Josh; Seaton Amy

Systems Analyst I
Craig Brett; Sewell Beth; Robbins Erin; Bush Emily; Zebras Steve

Systems Analyst II
Chandler Joseph; Burklow Shane; Robbins Erin

DB Designer I
Yarbrough Peter; Smith Mary

DB Designer II
Yarbrough Peter; Pascoe Jonathan

Cobol I
Kattan Chris; Epahnor Victor; Summers Anna; Ellis Maria

Cobol II
Kattan Chris; Epahnor Victor, Batts Melissa

C++ I
Smith Jose; Rogers Adam; Cope Leslie

C++ II
Rogers Adam; Bible Hanah

VB I
Zebras Steve; Ellis Maria

VB II
Zebras Steve; Newton Christopher

ColdFusion I
Duarte Miriam; Bush Emily

ColdFusion II
Bush Emily; Newton Christopher

ASP I
Duarte Miriam; Bush Emily

ASP II
Duarte Miriam; Newton Christopher

Oracle DBA
Smith Jose; Pascoe Jonathan

SQL Server DBA
Yarbrough Peter; Smith Jose

Network Engineer I
Bush Emily; Smith Mary

Network Engineer II
Bush Emily; Smith Mary

Web Administrator
Bush Emily; Smith Mary; Newton Christopher

Technical Writer
KilbySurgena; Bender Larry

Project Manager
Paine Brad; Mudd Roger; Kenyon Tiffany; Connor Sean

• GCS has many customers. Each customer has a customer ID, customer name, phone number, and region.
• GCS works by projects. A project is based on a contract between the customer and GCS to design, develop, and implement a computerized solution. Each project has specific characteristics such as the project ID, the customer to which the project belongs, a brief description, a project date (that is, the date on which the project’s contract was signed), a project start date (an estimate), a project end date (also an estimate), a project budget (total estimated cost of project), an actual start date, an actual end date, an actual cost, and one employee assigned as manager of the project.
• The actual cost of the project is updated each Friday by adding that week’s cost (computed by multiplying the hours each employee worked by the rate of pay for that skill) to the actual cost.
• The employee who is the manager of the project must complete a project schedule, which is, in effect, a design and development plan. In the project schedule (or plan), the manager must determine the tasks that will be performed to take the project from beginning to end. Each task has a task ID, a brief task description, the task’s starting and ending date, the type of skill needed, and the number of employees (with the required skills) required to complete the task. General tasks are initial interview, database and system design, implementation, coding, testing, and final evaluation and sign-off. For example, GCS might have the project schedule shown in Table P5.11b.

Table P5.11b Project Schedule Form

Project ID: 1 Description: Sales Management System
Company : See Rocks Contract Date: 2/12/2016 Region: NW
Start Date: 3/1/2016 End Date: 7/1/2016 Budget: $15,500

Start Date
End Date
Task
Description
Skill(s)
Required
Quantity Required

3/1/16
3/6/16
Initial Interview
Project Manager
Systems Analyst II
DB Designer I
1
1
1

3/11/16
3/15/16
Database Design
DB Designer I
1

3/11/16
4/12/16
System Design
Systems Analyst II
Systems Analyst I
1
2

3/18/16
3/22/16
Database Implementation
Oracle DBA
1

3/25/16
5/20/16
System Coding & Testing
Cobol I
Cobol II
Oracle DBA
2
1
1

3/25/16
6/7/16
System Documentation
Technical Writer
1

6/10/16
6/14/16
Final Evaluation
Project Manager
Systems Analyst II
DB Designer I
Cobol II
1
1
1
1

6/17/16
6/21/16
On-Site System Online and Data Loading
Project Manager
Systems Analyst II
DB Designer I
Cobol II
1
1
1
1

7/1/16
7/1/16
Sign-Off
Project Manager
1

• Assignments: GCS pools all of its employees by region, and from this pool, employees are assigned to a specific task scheduled by the project manager. For example, for the first project’s schedule, you know that for the period 3/1/16 to 3/6/16, a Systems Analyst II, a Database Designer I, and a Project Manager are needed. (The project manager is assigned when the project is created and remains for the duration of the project). Using that information, GCS searches the employees who are located in the same region as the customer, matching the skills required and assigning them to the project task.
• Each project schedule task can have many employees assigned to it, and a given employee can work on multiple project tasks. However, an employee can work on only one project task at a time. For example, if an employee is already assigned to work on a project task from 2/20/16 to 3/3/16, (s)he cannot work on another task until the current assignment is closed (ends). The date on which an assignment is closed does not necessarily match the ending date of the project schedule task, because a task can be completed ahead of or behind schedule. The date on which an assignment is closed does not necessarily match the ending date of the project schedule task because a task can be completed ahead of (or behind) schedule.
• Given all of the preceding information, you can see that the assignment associates an employee with a project task, using the project schedule. Therefore, to keep track of the assignment, you require at least the following information: assignment ID, employee, project schedule task, date assignment starts, and date assignment ends (which could be any dates as some projects run ahead of or behind schedule). Table P5.11c shows a sample assignment form.

P5.11c Project Assignment Form

Project ID: 1 Description: Sales Management System
Company: See Rocks Contract Date: 2/12/2010 As of: 03/29/10

SCHEDULED
ACTUAL ASSIGNMENTS

Project
Task
Start
Date
End Date

Skill

Employee
Start Date
End Date

Initial Interview
3/1/16
3/6/16
Project Mgr.
Sys. Analyst II
DB Designer I
101—Connor S.
102—Burklow S.
103—Smith M.
3/1/16
3/1/16
3/1/16
3/6/16
3/6/16
3/6/16

Database Design
3/11/16
3/15/16
DB Designer I
104—Smith M.
3/11/16
3/14/16

System Design
3/11/16
4/12/16
Sys. Analyst II
Sys. Analyst I
Sys. Analyst I
105—Burklow S.
106—Bush E.
107—Zebras S.
3/11/16
3/11/16
3/11/16

Database Implementation
3/18/16
3/22/16
Oracle DBA
108—Smith J.
3/15/16
3/19/16

System Coding & Testing
3/25/16
5/20/16
Cobol I
Cobol I
Cobol II
Oracle DBA
109—Summers A.
110—Ellis M.
111—Ephanor V.
112—Smith J.
3/21/16
3/21/16
3/21/16
3/21/16

System Documentation
3/25/16
6/7/16
Tech. Writer
113—Kilby S.
3/25/16

Final Evaluation
6/10/16
6/14/16
Project Mgr.
Sys. Analyst II
DB Designer I
Cobol II

On-Site System Online and Data Loading
6/17/16
6/21/16
Project Mgr.
Sys. Analyst II
DB Designer I
Cobol II

Sign-Off
7/1/16
7/1/16
Project Mgr.

(Note: The assignment number is shown as a prefix of the employee name; for example, 101, 102.) Assume that the assignments shown previously are the only ones existing as of the date of this design. The assignment number can be whatever number matches your database design.
• The hours an employee works are kept in a work log containing a record of the actual hours worked by an employee on a given assignment. The work log is a weekly form that the employee fills out at the end of each week (Friday) or at the end of each month. The form contains the date (of each Friday of the month or the last work day of the month if it doesn’t falls on a Friday), the assignment ID, the total hours worked that week (or up to the end of the month), and the number of the bill to which the work log entry is charged. Obviously, each work log entry can be related to only one bill. A sample list of the current work log entries for the first sample project is shown in Figure P5.11d.

Table P5.11d Project Work-Log Form as of 3/29/16

Employee
Name
Week
Ending
Assignment
Number
Hours
Worked
Bill
Number

Burklow S.
3/1/16
1-102
4
xxx

Connor S.
3/1/16
1-101
4
xxx

Smith M.
3/1/16
1-103
4
xxx

Burklow S.
3/8/16
1-102
24
xxx

Connor S.
3/8/16
1-101
24
xxx

Smith M.
3/8/16
1-103
24
xxx

Burklow S.
3/15/16
1-105
40
xxx

Bush E.
3/15/16
1-106
40
xxx

Smith J.
3/15/16
1-108
6
xxx

Smith M.
3/15/16
1-104
32
xxx

Zebras S.
3/15/16
1-107
35
xxx

Burklow S.
3/22/16
1-105
40

Bush E.
3/22/16
1-106
40

Ellis M.
3/22/16
1-110
12

Ephanor V.
3/22/16
1-111
12

Smith J.
3/22/16
1-108
12

Smith J.
3/22/16
1-112
12

Summers A.
3/22/16
1-109
12

Zebras S.
3/22/16
1-107
35

Burklow S.
3/29/16
1-105
40

Bush E.
3/29/16
1-106
40

Ellis M.
3/29/16
1-110
35

Ephanor V.
3/29/16
1-111
35

Kilby S.
3/29/16
1-113
40

Smith J.
3/29/16
1-112
35

Summers A.
3/29/16
1-109
35

Zebras S.
3/29/16
1-107
35

Note: xxx represents the bill ID. Use the one that matches the bill number in your database.

(Note: xxx represents the bill ID. Use the one that matches the bill number in your database.)
• Finally, every 15 days, a bill is written and sent to the customer, totaling the hours worked on the project that period. When GCS generates a bill, it uses the bill number to update the work-log entries that are part of that bill. In summary, a bill can refer to many work log entries, and each work log entry can be related to only one bill. GCS sent one bill on 3/15/16 for the first project (See Rocks), totaling the hours worked between 3/1/16 and 3/15/16. Therefore, you can safely assume that there is only one bill in this table and that that bill covers the work-log entries shown in the above form.
Your assignment is to create a database that will fulfill the operations described in this problem. The minimum required entities are employee, skill, customer, region, project, project schedule, assignment, work log, and bill. (There are additional required entities that are not listed.)
• Create all of the required tables and all of the required relationships.
• Create the required indexes to maintain entity integrity when using surrogate primary keys.
• Populate the tables as needed (as indicated in the sample data and forms).

Question: Global Computer Solutions (GCS) is an information