MySQL queries
Bajet $30-250 USD
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.
Schema:
MACHINE
Machine ID
Machine name, text
Date purchased
Cost of purchase, integer
CountsCoins, bool
Serial number, text
LOCATION
idLocation
Name
EXPENSE
idExpense
Expense, text
Date
TotalExpense, float
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TOTALPLAYS
idTotalplays
Totalplays, integer
Date
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TOTALEARNINGS
idTotalearnings
ResetEarnings, bool
Coins left, integer
Coins right, integer
TotalEarnings, float
Date
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Dianugerahkan kepada:
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