MYSQL 联合分组依据

Question

我正在做这个select声明：

SELECT * FROM (
SELECT COUNT(t.text) as count, COUNT(DISTINCT(t.from_user_id)) as usercount, DATE_FORMAT(t.created_at,'%Y-%m-%d %H:00') datepart 
FROM TABLE1 t WHERE t.created_at >= '2015-08-12 00:00:00' AND t.created_at <= '2015-08-13 18:30:00' AND t.eliminar IS NULL 
GROUP BY datepart) as t
UNION ALL
SELECT * FROM (
SELECT COUNT(b.id) as count, COUNT(DISTINCT(b.from_user_id)) as usercount, DATE_FORMAT(b.created_at,'%Y-%m-%d %H:00') datepart 
FROM TABLE2 b WHERE b.created_at >= '2015-08-12 00:00:00' AND b.created_at <= '2015-08-13 18:30:00' AND b.eliminar IS NULL 
GROUP BY datepart) as x GROUP BY datepart

这个 select 得到这个：

我正在尝试使用 datepart 分组进行查看，但我不能，知道我做错了什么吗？

TABLE2 只有 (id,from_user_id,eliminar) 并且除了 created_at 之外都是 NULL，在这一行中我有整个 2015 年的每一天和每一小时，格式与 TABLE1

Answer 1

已解决：

SELECT DISTINCT * FROM (
SELECT COUNT(t.text) as count, COUNT(DISTINCT(t.from_user_id)) as usercount, DATE_FORMAT(t.created_at,'%Y-%m-%d %H:00') datepart 
FROM TABLE1 t WHERE t.created_at >= '2015-08-12 00:00:00' AND t.created_at <= '2015-08-13 18:30:00' AND t.eliminar IS NULL 
GROUP BY datepart
UNION ALL
SELECT COUNT(t.id) as count, COUNT(DISTINCT(t.from_user_id)) as usercount, DATE_FORMAT(t.created_at,'%Y-%m-%d %H:00') datepart 
FROM TABLE2 t WHERE t.created_at >= '2015-08-12 00:00:00' AND t.created_at <= '2015-08-13 18:30:00' AND t.eliminar IS NULL 
GROUP BY datepart) as x GROUP BY datepart ORDER BY datepart

MYSQL 联合分组依据

MYSQL UNION GROUP BY

mysql

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union-all