Question

我有2个分组的查询，我试图显示0个值。

SELECT plan, locale, COUNT( * ) AS res
FROM  domain 
WHERE status LIKE  "active"
AND plan IS NOT NULL 
GROUP BY plan, locale

我知道我必须在同一张桌子上进行左连接，但我无法使其正常工作

SELECT d1.plan, d1.locale, IFNULL(COUNT(d2.id), 0) AS res
FROM domain AS d1
LEFT JOIN domain AS d2 ON d1.id = d2.id
WHERE d1.plan IS NOT NULL 
GROUP BY d1.plan, d1.locale

我做错了什么？

感谢您的帮助。

Answer 1

不要使用where条款。使用条件聚合：

SELECT plan, locale,
       sum(case when status LIKE 'active' AND plan IS NOT NULL then 1 else 0 end) as res
FROM  domain 
GROUP BY plan, locale;

编辑：

SELECT plan, locale,
       sum(case when status LIKE 'active' then 1 else 0 end) as res
FROM  domain 
WHERE plan is not null
GROUP BY plan, locale;

多个GROUP BY + COUNT在同一个表上显示0个值

1 个答案: