MySQL queries

In this project you will create four MySQL queries. The schema is below, I have attached an EER, and a database dump including sample data will be provided on project acceptance.

We have a database that stores records of earnings and expenses for various machines. For earnings, half of the machines show their earnings as a single amount, e.g. $1,250.25. The other half show their earnings as two values, CoinsLeft and CoinsRight. If CoinsLeft is 1205 and CoinsRight is 962 the dollar amounts would be $301.25 and $240.50, (1205 / 4) and (962 / 4) for a total of $541.75.

Half of the time, amounts recorded are the cumulative total amount earned over the lifetime of the machine. The other half of the time, the amount is just the amount shown, and in these cases the BOOL field ResetEarnings is TRUE.

Queries needed for this project:

1) For a specified date range, show the sum of TotalEarnings OR the total of (CoinsLeft and CoinsRight) for each idMachine. Group results by Location.

If a given idMachine's CountsCoins is TRUE, calculate the total of (CoinsLeft + CoinsRight) / 4 ), otherwise calculate TotalEarnings.

In all cases, you must subtract the last entry's amount from the current entry, EXCEPT the first entry which is not counted in the sum.

However, if a given TotalEarnings row has a TRUE ResetEarnings field, do not subtract the prior entry's earnings and instead add the full amount of TotalEarnings or (CoinsLeft + CoinsRight / 4) for that entry.

Example 1:

idMachine, date, TotalEarnings, ResetEarnings

1, 1/1/2018, 100, 0

1, 1/7/2018, 150, 0

1, 1/14/2018, 250, 0

1, 1/21/2018, 20, 1

1, 1/28/2018, 120, 0

For date range 1/1/2018 - 1/7/2018 the total for idMachine 1 would be: (150 - 100) = $50

For date range 1/1/2018 - 1/14/2018 the total for idMachine 1 would be: (150 - 100) + (250 - 150) = $150

For date range 1/1/2018 - 1/21/2018 the total for idMachine 1 would be: (150 - 100) + (250 - 150) + (20 - 0) = $170

For date range 1/1/2018 - 1/28/2018 the total for idMachine 1 would be: (150 - 100) + (250 - 150) + (20 - 0) + (120 - 20) = $270

Example 2:

idMachine, date, ResetEarnings, CountsCoins, CoinsLeft, CoinsRight

2, 1/1/2018, 0, 1, 4, 8

2, 1/7/2018, 0, 1, 16, 21

2, 1/14/2018, 1, 1, 8, 16

2, 1/21/2018, 0, 1, 10, 20

For date range 1/1/2018 - 1/7/2018 the total for idMachine 2 would be: (16 - 4) + (21 - 8) / 4 = $6.25

For date range 1/1/2018 - 1/14/2018 the total for idMachine 2 would be: (6.25) + ((8 + 16) / 4 )) = $12.25

For date range 1/1/2018 - 1/21/2018 the total for idMachine 2 would be: ($12.25) + (10 - 8) + ((20 - 16) / 4 ) = $13.75

2) For a specific date range, show the sum of Expenses per idMachine, grouped by Location.

3) For a specific date range, show the /net/ (e.g. the result of query 1 minus the result of query 2) per idMachine, grouped by location, WITH a net sum of the machines in each location.

4) For a specific date range, show the number of plays per idMachine, grouped by location. Similar to TotalEarnings, you must subtract the number of plays from the previous entry, and total plays can also be reset when the ResetPlays field is TRUE.



Machine ID

Machine name, text

Date purchased

Cost of purchase, integer

CountsCoins, bool

Serial number, text






Expense, text


TotalExpense, float

[login to view URL]

[login to view URL]



Totalplays, integer


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[login to view URL]



ResetEarnings, bool

Coins left, integer

Coins right, integer

TotalEarnings, float


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Skills: Database Administration, MySQL, SQL

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Project ID: #16263004

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