Invoices per Country SQL Certification

This script is designed to provide an overview of customer distribution and spending habits across different countries. It fetches data from four tables: 'country', 'city', 'customer', and 'invoice'. The script calculates the total number of customers and the average total price of invoices for each country. It then filters out the countries where the average total price of invoices is less than the overall average.

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Here is the Invoices per Country SQL Certification from HackerRank using CodeRankGPT:

The script uses SQL's SELECT, FROM, INNER JOIN, GROUP BY, and HAVING clauses to achieve its goal. It first joins the 'country', 'city', 'customer', and 'invoice' tables based on their respective IDs. It then groups the results by country name and calculates the total number of customers and the average total price of invoices for each group. Finally, it uses the HAVING clause to filter out the groups where the average total price is less than the overall average. This approach ensures that only the countries where customers spend more than average are included in the final result.


SELECT 
    co.country_name,
    COUNT(*) AS total_customers,
    ROUND(AVG(i.total_price), 6) AS avg_total_price
FROM 
    country AS co
    INNER JOIN city AS ci ON co.id = ci.country_id
    INNER JOIN customer AS cu ON ci.id = cu.city_id
    INNER JOIN invoice AS i ON cu.id = i.customer_id
GROUP BY 
    co.country_name
HAVING 
    AVG(i.total_price) > (SELECT AVG(total_price) FROM invoice);

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