SQL Statement獲取上週，月和年的記錄

Question

我在嘗試從SQLite數據庫獲取上一個周，月和年記錄時遇到了一些問題。我的數據庫表：

我只設法獲得今天的紀錄，昨天，這周，這個月和這年。

對於本週：

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 

這個月：

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 

對於今年：

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 

但我不知道如何改變SQL語句來獲得last周，月和年。有任何想法嗎？

在此先感謝。

Answer 1

您已經在使用日期修飾符。 只是減去一個星期/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')