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SQL Project: Credit Card Transactions Analysis

Overview

Welcome to my SQL project! This repository contains SQL queries and solutions for analyzing a credit card transactions dataset. The project focuses on exploring spending patterns, transaction details, and growth metrics.

SQL Techniques Used

In this project, I employed various SQL techniques to analyze the credit card transactions dataset:

1. Aggregation Functions:

  • Question 1: Top 5 Cities with Highest Spends and Percentage Contribution

    • Utilized SUM to calculate total spending.
    • Employed ROUND to calculate the percentage contribution.

  • Question 4: City with Lowest Percentage Spend for Gold Card Type

    • Used SUM and ROUND in conjunction with CASE to calculate the lowest percentage spend for Gold card type.

  • Question 5: City, Highest Expense Type, Lowest Expense Type

    • Applied SUM for aggregation.
    • Used CASE for conditional aggregation.

  • Question 6: Percentage Contribution of Spends by Females for Each Expense Type

    • Utilized SUM and ROUND in conjunction with CASE to calculate the percentage contribution of spends by females.

2. Window Functions:

  • Question 2: Highest Spend Month and Amount for Each Card Type

    • Leveraged DATEPART to extract month information.
    • Used MAX to find the highest amount spent.

  • Question 7: Card and Expense Type with Highest Month over Month Growth in Jan-2014

    • Applied LAG to calculate month-over-month growth.

  • Question 8: City with Highest Total Spend to Total Number of Transactions Ratio During Weekends

    • Used SUM and COUNT for aggregation.
    • Filtered results based on the day of the week using DATEPART.

3. Subqueries:

  • Question 3: Transaction Details for Each Card Type with Cumulative Spends of 1000000
    • Implemented a subquery to calculate cumulative spending.
    • Used RANK to identify the first occurrence of reaching 1000000 total spends.

4. Date and Time Functions:

  • Question 9: City that Took Least Number of Days to Reach its 500th Transaction
    • Utilized DATEDIFF to calculate the number of days.
    • Used ROW_NUMBER to identify the first and 500th transactions.

How to Run Queries

  1. Ensure you have a SQL Server database set up.
  2. Open solutions.sql in your SQL Server Management Studio (SSMS) or any SQL query tool.
  3. Execute the queries to analyze the credit card transactions data.

Conclusion

Summarize the key findings obtained from the analysis, highlighting any interesting patterns or trends discovered in the credit card transactions data.

Acknowledgments

  • I would like to express my gratitude to Ankit Bansal, a SQL expert from Namaste SQL, for his valuable guidance and support throughout the development of this project.

Certifications

1. Namaste SQL Certification

  • Organization: Namaste SQL
  • Completion Date: [November 2023]
  • Certification Link: Namaste SQL Certification
  • Description: This certification was obtained from Namaste SQL, providing expertise in SQL.

2. SQL HackerRank Golden Badge

  • Organization: HackerRank
  • Completion Date: [October 2023]
  • Description: Achieved the HackerRank Golden Badge in SQL, demonstrating proficiency in various SQL challenges on HackerRank.

3. SQL HackerRank Intermediate Certificate

  • Organization: HackerRank
  • Completion Date: [March 2023]
  • Certificate Link: SQL HackerRank Intermediate Certificate
  • Description: Earned the HackerRank Intermediate Certificate in SQL by successfully solving 53 out of 58 SQL challenges.