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Write a query to display owner name,address ,meter number and total units consumed by all the customers in the month december 2017.Display the records in descending order by total_units.Note:1. Display only the below 4 columns,     i. owner name     ii. address     iii. meter number     iv. Total unitsby all the customers in the month december 2017.2. Use Joins3. Tables involved building, meter and bill4. Specify condition on year, month column of bill table5. Order by is mandatory.

Question

Write a query to display owner name,address ,meter number and total units consumed by all the customers in the month december 2017.Display the records in descending order by total_units.Note:1. Display only the below 4 columns,     i. owner name     ii. address     iii. meter number     iv. Total unitsby all the customers in the month december 2017.2. Use Joins3. Tables involved building, meter and bill4. Specify condition on year, month column of bill table5. Order by is mandatory.

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Solution

Here is the SQL query you asked for:

SELECT 
    b.owner_name, 
    b.address, 
    m.meter_number, 
    SUM(bi.total_units) AS total_units
FROM 
    building b
JOIN 
    meter m ON b.building_id = m.building_id
JOIN 
    bill bi ON m.meter_id = bi.meter_id
WHERE 
    YEAR(bi.bill_date) = 2017 AND MONTH(bi.bill_date) = 12
GROUP BY 
    b.owner_name, 
    b.address, 
    m.meter_number
ORDER BY 
    total_units DESC;

This query does the following:

  1. Joins the building, meter, and bill tables based on the building_id and meter_id.
  2. Filters the records for the month of December 2017 using the WHERE clause.
  3. Groups the records by owner_name, address, and meter_number.
  4. Calculates the total units consumed by each customer using the SUM function.
  5. Orders the results in descending order by total_units.

This problem has been solved

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