多列/从哪里查询SQL查询

Question

这里对网站和SQL查询一般都不熟悉，所以请原谅这里的noobness。我希望创建一个返回3列（从单个表）的SQL查询：

1. 另类 “Region__C”
2. “ID” 去哪儿 “ACTIVE__C” 是 “Y”
3. 计数的计数“ID”的地方其中“ACTIVE__C”是“N”

下面是查询将执行＃1和＃2或＃3。只是不知道如何接近创造相同的查询都列＃2，＃3：

SELECT DISTINCT SCHEMA.CONTACT.REGION__C AS "Region",COUNT(SCHEMA.CONTACT.ID) AS "Active Contacts" 
FROM SCHEMA.CONTACT 
WHERE SCHEMA.CONTACT.ACTIVE__C = 'Y' AND SCHEMA.CONTACT.REGION__C != 'Unknown' 
GROUP BY SCHEMA.CONTACT.REGION__C 

预先感谢任何帮助，任何人都可以提供！

Answer 1

SELECT SCHEMA.CONTACT.REGION__C , 
     COUNT(CASE WHEN SCHEMA.CONTACT.ACTIVE__C = 'Y' THEN 1 
       END) AS Y , 
     COUNT(CASE WHEN SCHEMA.CONTACT.ACTIVE__C = 'N' THEN 1 
       END) AS N 
FROM SCHEMA.CONTACT 
WHERE SCHEMA.CONTACT.ACTIVE__C IN ('N', 'Y') AND 
        SCHEMA.CONTACT.REGION__C != 'Unknown' 
GROUP BY SCHEMA.CONTACT.REGION__C 

Answer 2

我认为这将工作：

SELECT DISTINCT SCHEMA.CONTACT.REGION__C AS "Region", 
sum(case ACTIVE__C when 'Y' then 1 else 0 end) as "CountActive", 
sum(case ACTIVE__C when 'N' then 1 else 0 end) as "CountInactive", 
COUNT(SCHEMA.CONTACT.ID) AS "Active Contacts" 
FROM SCHEMA.CONTACT 
WHERE SCHEMA.CONTACT.REGION__C != 'Unknown' 
GROUP BY SCHEMA.CONTACT.REGION__C