查询最后一天,上周,上个月SQLite

Question

我的Android SQLite DB中有这个表:

CREATE TABLE statistics (subject TEXT, hits INTEGER, fails INTEGER, date DATE)

在date字段中,储存datetime('now', 'localtime')在每个寄存器中.

现在我必须查询最后一天,上周和上个月的寄存器以显示一些统计信息.我一直在尝试这样的事情

    SELECT Timestamp, datetime('now', '-1 week') FROM statistics WHERE TimeStamp < datetime('now', '-1 week') 

还有这个

    SELECT * FROM statistics WHERE date BETWEEN datetime('now', localtime') AND datetime ( 'now', '-1 month')

并不起作用:(

我该怎么做？

我可以通过简单地在虚拟设备模拟器中转发日期来检查查询是否正常吗？

谢谢!

Answer 1

我找到了这个解决方案.我希望这个对你有用.

最后一天:

SELECT * FROM statistics WHERE date BETWEEN datetime('now', 'start of day') AND datetime('now', 'localtime');

上周:

SELECT * FROM statistics WHERE date BETWEEN datetime('now', '-6 days') AND datetime('now', 'localtime');

上个月:

SELECT * FROM statistics WHERE date BETWEEN datetime('now', 'start of month') AND datetime('now', 'localtime');

Answer 2

这个代码应该让你上个月

SELECT * 
FROM statistics 
WHERE date >= date('now','start of month','-1 month')
AND date < date('now','start of month')