php - I want to get each month expense from three table -

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i have 3 table named "salary", "allowance" , "bill".

"salary" table has 

 s_id [primary key], e_id, s_amount, s_date.

"allowanace" table has 

 a_id[primary key], e_id, a_ta, a_da, a_ma, a_others, a_date, total_a

"bill" table has 

 e_id[primary key], electric, gas, water, b_others, b_date total_b

i have joined these tables query>>

 select       sum(allowance.`a_ta`+allowance.`a_da`      +allowance.`a_ma`+allowance.`a_others`)      total_allowance,       (sum(salary.`s_amount`)) total_salary,        sum(bill.`electric`+bill.`water`+bill.`gas`+bill.`b_others`)        total_bill,      (sum(allowance.`a_ta`+allowance.`a_da`+allowance.`a_ma`       +allowance.`a_others`)+sum(salary.`s_amount`)       +sum(bill.`electric`+bill.`water`+bill.`gas`+bill.`b_others`))       total_ex        salary       inner join allowance       on salary.e_id=allowance.e_id        inner join bill       on salary.s_date=bill.b_date

i want total expense "total_ex" of january 2015, december 2015, october 2016, november 2016...each month's total expense separately.

try using sum , if: 

sum(if(date_format(salary.s_date,'%m')='january', allowance.a_ta+allowance.a_da+allowance.a_ma +allowance.a_others +salary.s_amount+bill.electric+bill.water +bill.gas+bill.b_others,0))  jan_total_ex

this give jan total expense.


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