SQL Statement获取上周，月和年的记录

Question

我在尝试从SQLite数据库获取上一个周，月和年记录时遇到了一些问题。我的数据库表：

我只设法获得今天的纪录，昨天，这周，这个月和这年。

对于本周：

SELECT SUM(amount) AS Total, (substr(date, 7, 4) || '-' || substr(date, 4, 2) || '-' || substr(date,1, 2)) AS currentDate FROM TransactionRec WHERE currentDate BETWEEN DATE('now', '-7 days') AND Date('now') GROUP BY currentDate 

这个月：

SELECT SUM(amount) AS Total, (substr(date, 7, 4) || '-' || substr(date, 4, 2) || '-' || substr(date,1, 2)) AS currentDate FROM TransactionRec WHERE currentDate BETWEEN DATE('now', 'start of month') AND Date('now') GROUP BY currentDate 

对于今年：

SELECT SUM(amount) AS Total, (substr(date, 7, 4) || '-' || substr(date, 4, 2) || '-' || substr(date,1, 2)) AS currentDate FROM TransactionRec WHERE currentDate BETWEEN DATE('now', '-1 year') AND Date('now')GROUP BY currentDate 

但我不知道如何改变SQL语句来获得last周，月和年。有任何想法吗？

在此先感谢。

Answer 1

您已经在使用日期修饰符。 只是减去一个星期/月/年：

... BETWEEN date('now', '-14 days') AND date('now', '-7 days') 
... BETWEEN date('now', 'start of month', '-1 months') AND date('now', 'start of month', '-1 days') 
... BETWEEN date('now', '-2 years') AND date('now', '-1 years')