Question

I have an SQLite database which contains transactions, each of them having a price and a transDate.

I want to retrieve the sum of the transactions grouped by month. The retrieved records should be like the following:

Price    month
230        2
500        3
400        4

Answer 1

it is always good while you group by MONTH it should check YEAR also

select SUM(transaction) as Price, 
       DATE_FORMAT(transDate, "%m-%Y") as 'month-year' 
       from transaction group by DATE_FORMAT(transDate, "%m-%Y");

FOR SQLITE

select SUM(transaction) as Price, 
       strftime("%m-%Y", transDate) as 'month-year' 
       from transaction group by strftime("%m-%Y", transDate);