问题
I'm quite new to access and I am currently in the process of making a database for my company.
I have a 'Jobs' table with these fields in:
- Job No.
- Year Initiated
- Month Initiated
- Company ID
- Job Description
- Amount Quoted
- Amount to Invoice
- Invoice Number
- Completed By
- Cost
- Profit
What I want to know Is what is the best way/ how do I calculate either in a form or query the overall profit for each month?
Please help, the database is really coming along, apart from this is well entruely stuck on.
回答1:
You want to find all rows matching a specific year / month, and add together all the profit entries for that month to get a total?
If so, try this :
select sum(profit) from Jobs where year = 2013 and month = 02
Or, if you want to retrieve this information for all months in one go, try this :
select year, month, sum(profit) from Jobs group by year, month
来源：https://stackoverflow.com/questions/17789984/how-do-i-calculate-a-profit-for-each-month-in-ms-access