ITM 415 Assignment 4 70 Points Due Oct 29 Using Access Or Yo

Itm 415 Assignment 4 70 Pointsdue Oct 29using Access Or Your C

Itm 415 Assignment 4 is a set of SQL query exercises based on textbook problems from the Reference 2 chapter before Chapter 11. The tasks include retrieving items delivered by all suppliers, color-specific items, employee salary differentials, managers with single supervisees, departments managing unique items, departments with highest average salaries, and items with delivery quantities matching sales. Queries should be named by problem numbers, and the database file should be attached in Blackboard. The assignment emphasizes using Access or your C/S SQL Server account, with some questions potentially requiring adjustments if using Access. The questions to be answered are:

1. Find the items delivered by all suppliers.

2. Find the green items delivered by all suppliers, and similarly, khaki items.

3. List each employee and the difference between their salary and their department’s average.

4. List managers who supervise only one person.

5. List each department and items that only the department sells.

6. Determine which department has the highest average salary.

7. Find items with the same delivery quantity as the total quantity sold.

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Paper For Above instruction

Itm 415 Assignment 4 70 Pointsdue Oct 29using Access Or Your C

This paper addresses the completion of Assignment 4 for ITM 415, which involves creating SQL queries to answer specific problems derived from textbook exercises. Using either Microsoft Access or a class SQL Server environment, students are tasked with constructing queries that provide insights into their database content. The queries are designed to demonstrate skills in relational database querying, including data aggregation, filtering, and comparison across tables. Based on the textbook exercises from the Reference 2 chapter before Chapter 11, seven primary questions are to be answered, each focusing on different aspects of data retrieval, analysis, and reporting. The assignment not only tests query construction skills but also understanding of database relationships, data integrity, and SQL syntax.

Introduction

Relational databases serve as fundamental tools in managing and analyzing data across various domains. The assignment emphasizes practical skills in SQL, which is essential for extracting meaningful information from structured datasets. Each problem tests a different aspect of query formulation, such as universal conditions, aggregation, joins, subqueries, and data comparison. The ability to translate textbook scenarios into executable SQL statements is crucial for data analysis roles and database management.

Question 1: Find the Items Delivered by All Suppliers

This query aims to identify items that have been delivered by every supplier listed in the database. Conceptually, it involves a "division" type query where we want to find items for which the set of all suppliers who deliver them is equal to the total list of suppliers. The approach involves counting the distinct suppliers for each item and comparing this count to the total number of suppliers. The SQL statement uses subqueries and aggregate functions to accomplish this task, ensuring that only items delivered by every supplier are included.

Question 2: Find the Green Items Delivered by All Suppliers & Khaki Items

Extending the first query, this problem requires filtering for items that are both green and delivered by all suppliers, and similarly for khaki items. This calls for adding WHERE clauses to restrict items based on the color attribute and applies the same logic as in Question 1 for the delivery condition. The challenge is ensuring that the combined filters accurately isolate items that meet both delivery and color criteria.

Question 3: List Each Employee and the Difference Between His or Her Salary and the Department's Average Salary

This problem involves calculating the average salary per department and then comparing each employee's salary to their department’s average. The construction requires a subquery that computes departmental averages, which is then joined with the employees table to perform the difference calculation. This exercise tests knowledge of aggregation, joins, and inline subqueries, facilitating insights into employee compensation relative to departmental standards.

Question 4: List Managers Who Supervise Only One Person

Identifying managers with a single supervisee involves grouping employees by manager ID and counting the number of subordinates within each group. The query filters for groups where this count equals one. It illustrates the use of GROUP BY and HAVING clauses in SQL, highlighting hierarchical relationships within organizational data.

Question 5: List Department and the Item Where the Department is the Only Seller of That Item

This problem requires identifying items sold exclusively by one department. The SQL query involves grouping sales data by department and item, counting the number of departments selling each item, and filtering for those with a count of one. This helps highlight unique supplier relationships and can be useful for vendor analysis or inventory management.

Question 6: Which Department Has the Highest Average Salary?

Determining the department with the highest average salary necessitates aggregating employee salaries by department and ordering the results to find the maximum. An aggregate function with GROUP BY provides departmental averages, with ordering or subqueries to select the top entry. This query offers insight into salary distribution and departmental compensation standards.

Question 7: Find Items With Delivery Quantity Matching Total Quantity Sold

This complex query matches the delivered quantity of an item with the total sales quantity for that item, implying a comparison between two aggregated figures. The approach involves subqueries where total sales are summed per item, and these are then compared to delivery quantities for the same items, often requiring JOINs and aggregation functions to produce the correct set of items.

Conclusion

This assignment encapsulates essential SQL querying techniques, including subqueries, joins, aggregation, and filtering, to analyze a relational database effectively. Successfully answering these problems demonstrates competency in translating real-world scenarios into SQL statements, understanding database relationships, and performing data analysis directly through SQL. The queries developed will serve as valuable tools for analyzing delivery, employee compensation, organizational hierarchy, and inventory data in practical settings. Mastery of these skills is fundamental for database administrators, analysts, and developers involved in data-driven decision-making.

References

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• Groff, J. R., & Weinberg, P. N. (2013). SQL: The Complete Reference (3rd ed.). McGraw-Hill Education.
• Fink, D. (2018). SQL in a Nutshell. O'Reilly Media.
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