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Write a query to display the electricity readings for the meters with meter number 'SG923564' and 'SG288942' in descending order based on the total units consumed per day.

Question

Write a query to display the electricity readings for the meters with meter number 'SG923564' and 'SG288942' in descending order based on the total units consumed per day.

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Solution

Assuming you are using SQL and your table is named "ElectricityReadings", the query would look something like this:

SELECT MeterNumber, ReadingDate, SUM(UnitsConsumed) as TotalUnits
FROM ElectricityReadings
WHERE MeterNumber IN ('SG923564', 'SG288942')
GROUP BY MeterNumber, ReadingDate
ORDER BY TotalUnits DESC;

Here's the step by step explanation:

  1. SELECT MeterNumber, ReadingDate, SUM(UnitsConsumed) as TotalUnits: This line is selecting the columns we are interested in. We are summing the UnitsConsumed for each day and meter, and naming this new column "TotalUnits".

  2. FROM ElectricityReadings: This line is specifying the table we are selecting data from.

  3. WHERE MeterNumber IN ('SG923564', 'SG288942'): This line is filtering the data so that only rows where the MeterNumber is 'SG923564' or 'SG288942' are included.

  4. GROUP BY MeterNumber, ReadingDate: This line is grouping the data by MeterNumber and ReadingDate. This is necessary because we are using the SUM function, which is an aggregate function.

  5. ORDER BY TotalUnits DESC;: This line is ordering the results in descending order based on the TotalUnits column.

This problem has been solved

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