SQLITE查詢同一個表兩次，並將這些查詢放到兩個不同的列中？

Question

我的問題是如何做兩個select語句，並在單獨的colummns結果？

例如，

我的陳述

Select count(*) as "JAN" from tickets where created_at BETWEEN "2015-01-01" AND "2015-01-31" 
Select count(*) as "FEB" from tickets where created_at BETWEEN "2015-02-01" AND "2015-02-25" 

我試圖把一個逗號，並把括號中的第二陳述但是這並沒有任何工作。我不確定我究竟做錯了什麼。任何人都可以看看這個？提前感謝您的時間。

Answer 1

我想你甚至都不需要一個連接，如SQLite的支持CASE expression：

select 
sum(case 
    when created_at between '2015-01-01' and '2015-01-31' then 1 
    else 0 end) as "JAN", 
sum(case 
    when created_at between '2015-02-01' and '2015-02-25' then 1 
    else 0 end) as "FEB" 
from tickets 

Answer 2

你可以把選擇存儲標量子查詢：

SELECT (SELECT COUNT(*) 
     FROM tickets 
     WHERE created_at GLOB '2015-01*-') AS "JAN", 
     (SELECT COUNT(*) 
     FROM tickets 
     WHERE created_at GLOB '2015-02-*') AS "FEB";