sql - 在 SQLite 中按月分组

Question

我有一个包含交易的 SQLite 数据库，每个交易都有一个价格和一个transDate。

我想检索按月分组的交易总和。检索到的记录应如下所示:

Price    month
230        2
500        3
400        4

Answer 1

按 MONTH 分组总是好的，它也应该检查 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);