每天从时间戳开始的SQL组有两个表

Question

我有两个带有时间戳列的表。

表＃1包含点击次数，时间戳，表＃2包含用户ID，时间戳。我希望按日期计算点击次数和用户数。例如

Date        clicks_count  users_count

2015-07-24    10            15
2015-07-24    04            06

Answer 1

select date(timestamp), 
       sum(is_click) as clicks,
       sum(is_click = 0) as user_count
from
(
  select timestamp, 1 as is_click from table1
  union all 
  select timestamp, 0 from table2
) tmp
group by date(timestamp)

您可以同时从两个表中选择timestamp，并添加一个计算列，指示时间戳来自哪个表。

然后，您按照日期获取子查询结果和分组，并计算用户和点击次数。

sum(is_click = 0)计算来自users表的时间戳的时间。

Answer 2

我认为这些SQL对你有用。

select a.date1,clicks_count,users_count  from 
(select date(Table1.timestamp)as date1, count(clicks) as clicks_count
from Table1 
group by date(Table1.timestamp)) as a
join
(
select date(Table2.timestamp) date2, count(userid) as users_count
from Table2 
group by date(Table2.timestamp)) b on a.date1 = b.date2

谢谢。