Question

使用SQLite的新手。在构建查询时需要一些帮助。

基本上，我需要按类别分组的月度总计。现在所有3个间隔显示在同一列上。我希望每个区间显示为它自己的单独列。我该怎么办呢？

SELECT tickets.category AS 'Category', count(id) AS 'Interval'

FROM tickets 

WHERE strftime('%Y-%m-%d',tickets.created_at) >= date('now','-30 days') 
    AND strftime('%Y-%m-%d',tickets.created_at)<= date('now', '-7 days')

GROUP BY tickets.category

UNION ALL

SELECT tickets.category AS 'Category', count(id) 

FROM tickets 

WHERE strftime('%Y-%m-%d',tickets.created_at) >= date('now','-60 days') 
    AND strftime('%Y-%m-%d',tickets.created_at)<= date('now', '-31 days')

GROUP BY tickets.category

UNION ALL

SELECT tickets.category AS 'Category', count(id) 

FROM tickets 

WHERE strftime('%Y-%m-%d',tickets.created_at) >= date('now','-90 days') 
    AND strftime('%Y-%m-%d',tickets.created_at)<= date('now', '-61 days')

GROUP BY tickets.category

ORDER BY tickets.category DESC

Answer 1

这称为条件聚合。使用where中的count条件将它们作为单独的列。

SELECT category
,count(case when strftime('%Y-%m-%d',created_at) >= date('now','-30 days') 
       AND strftime('%Y-%m-%d',created_at)<= date('now', '-7 days') then id end) as days_7_30
,count(case when strftime('%Y-%m-%d',created_at) >= date('now','-60 days') 
       AND strftime('%Y-%m-%d',created_at)<= date('now', '-31 days') then id end) as days_31_60
,count(case when strftime('%Y-%m-%d',created_at) >= date('now','-90 days') 
       AND strftime('%Y-%m-%d',created_at)<= date('now', '-61 days') then id end) as days_61_90
FROM tickets 
GROUP BY category

按月间隔获取报告

1 个答案: