SQLITE查询同一个表两次，并将这些查询放到两个不同的列中？

Question

我的问题是如何做两个select语句，并在单独的colummns结果？

例如，

我的陈述

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" 

我试图把一个逗号，并把括号中的第二陈述但是这并没有任何工作。我不确定我究竟做错了什么。任何人都可以看看这个？提前感谢您的时间。

Answer 1

我想你甚至都不需要一个连接，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

你可以把选择存储标量子查询：

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";