在SQLite中按月分组

当您按MONTH分组时总是很好，还应该检查YEAR

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

对于SQLITE

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