Download, Unzip, And Attach The Sample Database Itco630 A

Download Unzip And Attach The Sample Database Itco630 A From The Lin

Download, unzip, and attach the sample database ITCO630_A from the link below. The sample database represents an educational institution with students and different schools. Each student goes to just one school. The students have various roles in different assignments and may work on more than one assignment at a time. Download the database for this assignment.

The following are the tables and data in the ITCO630_A database: Using the sample database, write the scripts in a file called ITCO630_P3.SQL to create the following views. Remember to include a USES clause at the top of the script file to use the ITCO630_A database. Also include code that checks if the view already exists. If it does, it should be dropped and recreated. Create a view named v_worker showing the student number, assignment number, and start date where the role is "worker." Create a view called v_no_points with all the columns of the assignment table except the points column. Create a view called v_count that shows the number of students working on each assignment. The view should have columns for the assignment number and the count.

Paper For Above instruction

Download Unzip And Attach The Sample Database Itco630 A From The Lin

Download Unzip And Attach The Sample Database Itco630 A From The Lin

Understanding the structure and content of the ITCO630_A database is essential for performing the required operations. This database models an educational institution with students, different schools, and assignments. Each student is associated with one school, but students can have multiple roles across assignments. Some students may work more than one assignment simultaneously, creating a complex web of relationships to analyze.

Introduction

The purpose of this assignment is to craft specific SQL views that extract meaningful insights from the database. The views are intended to simplify data retrieval for particular queries, such as identifying workers, excluding points data, and summarizing student participation per assignment. These views will serve as foundational elements for reporting and analytical tasks within the educational context.

Methodology and SQL Scripts

First, the script begins with a USE statement to specify the target database, ITCO630_A. Next, it implements logic to check whether each view already exists. If so, it drops the view before creating it anew. This ensures that the script can be rerun without errors due to existing objects.

1. Creating v_worker View

The v_worker view lists student numbers, assignment numbers, and start dates for roles where the role is "worker." This helps identify which students are actively working on assignments and when they started.

Sample SQL:



IF OBJECT_ID('dbo.v_worker', 'V') IS NOT NULL


DROP VIEW dbo.v_worker;


GO


CREATE VIEW dbo.v_worker AS


SELECT student_number, assignment_number, start_date


FROM assignments_roles -- assuming a table that links students to roles in assignments


WHERE role = 'worker';

2. Creating v_no_points View

The v_no_points view includes all columns from the assignment table except the points column. This simplifies reports where points are irrelevant or should be excluded.

Sample SQL:



IF OBJECT_ID('dbo.v_no_points', 'V') IS NOT NULL


DROP VIEW dbo.v_no_points;


GO


CREATE VIEW dbo.v_no_points AS


SELECT column1, column2, column3, ... -- list all columns except points


FROM assignment;

3. Creating v_count View

The v_count view summarises how many students are working on each assignment. It includes assignment numbers and the student count per assignment.

Sample SQL:



IF OBJECT_ID('dbo.v_count', 'V') IS NOT NULL


DROP VIEW dbo.v_count;


GO


CREATE VIEW dbo.v_count AS


SELECT assignment_number, COUNT(DISTINCT student_number) AS student_count


FROM assignments_roles -- or relevant table linking students and assignments


GROUP BY assignment_number;

Conclusion

This set of views provides targeted insights into student roles, assignment details, and participation levels within the educational database. Properly maintaining and updating such views supports efficient data analysis, reporting, and decision-making for educational administrators.

References

  • Elmasri, R., & Navathe, S. B. (2015). Database Systems (6th ed.). Pearson.
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