Question

我试图添加一周中同一天的值

我的查询：

SELECT c.CounterID,
total(CASE WHEN strftime('%w', c.Date) = 1 THEN c.Value ELSE 0 END) AS Monday,
total(CASE WHEN strftime('%w', c.Date) = 2 THEN c.Value ELSE 0 END) AS Tuesday,
total(CASE WHEN strftime('%w', c.Date) = 3 THEN c.Value ELSE 0 END) AS Wednesday,
total(CASE WHEN strftime('%w', c.Date) = 4 THEN c.Value ELSE 0 END) AS Thursday,
total(CASE WHEN strftime('%w', c.Date) = 5 THEN c.Value ELSE 0 END) AS Friday,
total(CASE WHEN strftime('%w', c.Date) = 6 THEN c.Value ELSE 0 END) AS Saturday,
total(CASE WHEN strftime('%w', c.Date) = 0 THEN c.Value ELSE 0 END) AS Sunday
FROM CounterItems c
GROUP BY c.CounterID

对于每周的每一天列，上面返回0。为什么不把它们加起来？

编辑：下面是我的表结构

ID|CounterID|Value|Date

EDIT2：这是日期格式2015-02-13 01:07:21

Answer 1

尝试将CAST() strftime功能转移到Integer。见下文：

SELECT c.CounterID,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 1 THEN c.Value ELSE 0 END) AS Monday,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 2 THEN c.Value ELSE 0 END) AS Tuesday,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 3 THEN c.Value ELSE 0 END) AS Wednesday,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 4 THEN c.Value ELSE 0 END) AS Thursday,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 5 THEN c.Value ELSE 0 END) AS Friday,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 6 THEN c.Value ELSE 0 END) AS Saturday,
       TOTAL(CASE WHEN CAST(strftime('%w', c.Date) AS INTEGER) = 0 THEN c.Value ELSE 0 END) AS Sunday
FROM CounterItems c
GROUP BY c.CounterID

在SQLite中添加具有相同日期的行

1 个答案: