我正试图弄清楚我的用户的一些滑动窗口统计信息。我有一个包含用户的表,以及created_at和verified_at等列。对于每个月,我想知道注册了多少用户(由created_at的date_trunc创建的一个简单组),然后是那些人,在我的滑动窗口中验证了多少(称为60天)。
我想做一个SQL查询,它给我一些类似的东西:
Month | Registered | Verified in 60 days
Jan 2009 | 1543 | 107
Feb 2009 | 2000 | 250
我正在使用postgresql。我开始看sum(case ...),但我不知道是否可以让我的情况以某种方式依赖于date_trunc。
当然,这不起作用,但这里的想法是:
SELECT DATE_TRUNC('month', created_at) as month,
COUNT(*) as registered,
SUM(CASE WHEN verified_at < month+60 THEN 1 ELSE 0 END) as verified
FROM users
GROUP BY DATE_TRUNC('month', created_at)
答案 0 :(得分:25)
SELECT COUNT(created_at) AS registered,
SUM(CASE WHEN verified_at <= created_at + '60 day'::INTERVAL THEN 1 ELSE 0 END) AS verified
FROM generate_series(1, 20) s
LEFT JOIN
users
ON created_at >= '2009-01-01'::datetime + (s || ' month')::interval
AND created_at < '2009-01-01'::datetime + (s + 1 || ' month')::interval
GROUP BY
s
答案 1 :(得分:0)
select sum(whatever), 'january' from user where month = 'january'
union all
select sum(whatever), 'february' from user where month = 'february'
...
答案 2 :(得分:0)
SELECT
MONTH,
COUNT(*) AS Registered,
SUM (CASE WHEN datediff(day,reg_date,ver_date) < 60 THEN 1 ELSE 0) as 'Verified in 60 //days datediff is an MSSQL function amend for postgresql'
FROM
TABLE
GROUP BY
MONTH