SQL：报错从日期和日期的日期范围，每天加入查询用于获取日期明智增量

Question

需要计数的用户的数量，一个例如如下所示：

select 
    '2017-06-01' as myDate 
, count(distinct user_id) 
from tbl_stats 
where date(dateTime)<='2017-06-01' 
union all 
select 
    '2017-06-02' as myDate 
, count(distinct user_id) 
from tbl_stats 
where date(dateTime)<='2017-06-02' 

的输出将是像：

reportDate | count 
------------+------- 
2017-06-01 | 2467 
2017-06-02 | 2470 

所以，我只是有没有fromdate和todate和我需要在表格日期明智不同的用户数。我不会使用任何程序或循环。

Answer 1

SELECT DATE(ts.dateTime) AS reportDate 
    , COUNT(distinct ts.user_id) AS userCount 
FROM tbl_stats AS ts 
WHERE ts.dateTime >= @lowerBoundDate 
    AND ts.dateTime < TIMESTAMPADD('DAY', 1, @upperBoundDate) 
GROUP BY DATE(ts.dateTime) 

Answer 2

要获得累积（不同）用户每天计数，请使用以下内容，将以下示例中给出的自定义日期替换为开始日期和结束日期。

WITH test_data AS (
     SELECT '2017-01-01'::date as event_date, 1::int as user_id 
     UNION 
     SELECT '2017-01-01'::date as event_date, 2::int as user_id 
     UNION 
     SELECT '2017-01-02'::date as event_date, 1::int as user_id 
     UNION 
     SELECT '2017-01-02'::date as event_date, 2::int as user_id 
     UNION 
     SELECT '2017-01-02'::date as event_date, 3::int as user_id 
     UNION 
     SELECT '2017-01-03'::date as event_date, 4::int as user_id 
     UNION 
     SELECT '2017-01-03'::date as event_date, 5::int as user_id 
     UNION 
     SELECT '2017-01-04'::date as event_date, 1::int as user_id 
     UNION 
     SELECT '2017-01-04'::date as event_date, 2::int as user_id 
     UNION 
     SELECT '2017-01-04'::date as event_date, 3::int as user_id 
     UNION 
     SELECT '2017-01-04'::date as event_date, 4::int as user_id 
     UNION 
     SELECT '2017-01-04'::date as event_date, 5::int as user_id 
     UNION 
     SELECT '2017-01-04'::date as event_date, 6::int as user_id 
     UNION 
     SELECT '2017-01-05'::date as event_date, 3::int as user_id 
     UNION 
     SELECT '2017-01-05'::date as event_date, 4::int as user_id 
     UNION 
     SELECT '2017-01-05'::date as event_date, 5::int as user_id 
     UNION 
     SELECT '2017-01-05'::date as event_date, 6::int as user_id 
     UNION 
     SELECT '2017-01-05'::date as event_date, 7::int as user_id 
     UNION 
     SELECT '2017-01-05'::date as event_date, 8::int as user_id 
     UNION 
     SELECT '2017-01-06'::date as event_date, 7::int as user_id 
     UNION 
     SELECT '2017-01-06'::date as event_date, 9::int as user_id 
) 
SELECT event_date, 
     COUNT(distinct user_id) AS distinct_user_per_day, 
     SUM(COUNT(distinct user_id)) OVER (ORDER BY event_date) AS cumulative_user_count 
FROM test_data 
WHERE event_date >= '2017-01-01' 
     AND 
     event_date <= '2017-01-06' 
GROUP BY 
     event_date