在 SQLite 中按月分组

Group by month in SQLite(在 SQLite 中按月分组)

问题描述

我有一个包含交易的 SQLite 数据库，每个交易都有一个 price 和一个 transDate.

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

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

推荐答案

当你按 MONTH 分组时，它也应该检查 YEAR 总是好的

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);

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