SQL query: calculate profile or loss in given 2 tables - mysql

Question

I have 2 tables storing income:
id name date price isDel
1 abc 2012-01-26 613.90 0
2 cde 2012-01-25 530.10 0
and expenses:
id name price date isDel
1 b1 334.90 2012-01-26 0
2 b1 41.90 2012-01-25 0
3 d1 61.90 2012-01-25 0
I would like to get the result as follows:
date total income total expense profile n loss
2012-01-25 530.10 103.80 426.30
2012-01-26 613.90 344.90 26.90
Thanks. Can anyone provide SQL solutions? I did refer some member's question and answer at stackoverflow but I can't modify to want I need. Please help.

Answer 1

Provided you want profit/loss per day this should do:
SELECT Inc.date, TotalInc, TotalExp, TotalInc - TotalExp AS ProfitNLoss
FROM
(
SELECT date, SUM(price) as TotalInc
FROM Income
WHERE isdel = 0
GROUP BY date) as Inc
LEFT OUTER JOIN
(
SELECT date, SUM(price) as TotalExp
FROM Expense
WHERE isdel = 0
GROUP BY date) as Exp
ON Inc.date = Exp.date
UNION
SELECT Exp.date, TotalInc, TotalExp, TotalInc - TotalExp AS ProfitNLoss
FROM
(
SELECT date, SUM(price) as TotalInc
FROM Income
WHERE isdel = 0
GROUP BY date) as Inc
RIGHT OUTER JOIN
(
SELECT date, SUM(price) as TotalExp
FROM Expense
WHERE isdel = 0
GROUP BY date) as Exp
ON Inc.date = Exp.date

Answer 2

Argh, this is "give me the codes" question, but I'll give you few hints:
mySQL GROUP BY tutorial
mySQL GRUOP BY aggregate functions
mySQL subqueries
So what you need to do:
Create list of all unique dates (unfortunately I haven't find a way to generate list of dates within sql without table query or without long php array, if anyone knows a way to do this I'll be glad to add it to anser), so you will have to do this:
SELECT date FROM income GROUP BY date;
-- If there's a chance that you'll have record in expenses and not in income:
(SELECT date FROM income GROUP BY date)
UNION (SELECT date FROM expenses GROUP BY date;)
GROUP BY date;
-- Or create table containing just list of all dates (best option)
And than join all unique dates with expenses and income:
SELECT SUM(expenses.price) AS expenses, SUM(incomes.price) AS income, dates.date
FROM unique_dates -- or from your subquery
LEFT JOIN incomes ON incomes.date = unique_dates.date
LEFT JOIN expenses ON expenses.date = unique_dates.date
GROUP BY unique_dates.date
Oh and I have no idea what does profile n loss mean.

Answer 3

Thanks to Pheiberg and appreciated for your prof reply.
I just did some little change so it will return 0 when table has no record or return NULL, So that Profit calculation still able to cal even given -ve value. Here the code share to u guys.
note: im using MySQL
SELECT Inc.create_dt, IFNULL(TotalInc,0), IFNULL(TotalExp,0), IFNULL(TotalInc,0) - IFNULL(TotalExp,0) AS ProfitNLoss
FROM
(
SELECT create_dt, SUM(price) as TotalInc
FROM income
WHERE IsDel= 0
GROUP BY create_dt) as Inc
LEFT OUTER JOIN
(
SELECT create_dt, SUM(price) as TotalExp
FROM expenses
WHERE IsDel= 0
GROUP BY create_dt) as Exp
ON Inc.create_dt= Exp.create_dt
UNION
SELECT Exp.create_dt, IFNULL(TotalInc,0), IFNULL(TotalExp,0), IFNULL(TotalInc,0) - IFNULL(TotalExp,0) AS ProfitNLoss
FROM
(
SELECT create_dt, SUM(price) as TotalInc
FROM income
WHERE IsDel= 0
GROUP BY create_dt) as Inc
RIGHT OUTER JOIN
(
SELECT create_dt, SUM(price) as TotalExp
FROM expenses
WHERE IsDel= 0
GROUP BY create_dt) as Exp
ON Inc.create_dt= Exp.create_dt