过去12个月,按周分组

Question

我有一个表REGDATE列,一个注册日期(YYYY-MM-DD HH:MM:SS).我想展示一个直方图(ExtJS),以了解用户注册的年份.我想在过去的十二个月中就当前日期和按周分组日期这样做.

任何提示？

Answer 1

在PostgreSQL中的FWIW,Karaszi有一个有效的答案,但有一个更快的查询:

SELECT date_trunc('week', REGDATE) AS "Week" , count(*) AS "No. of users"
FROM <<TABLE>>
WHERE REGDATE > now() - interval '12 months' 
GROUP BY 1
ORDER BY 1;

我的基础是Ben Goodacre的工作

Answer 2

在MySQL中:

SELECT COUNT(*), DATE_FORMAT(regdate, "%X%V") AS regweek FROM table GROUP BY regweek;

要么

SELECT COUNT(*), YEARWEEK(NOW(), 2) as regweek FROM table GROUP BY regweek;

在PostgreSQL中:

SELECT COUNT(*), EXTRACT(YEAR FROM regdate)::text ||  EXTRACT(WEEK FROM regdate)::text AS regweek FROM table GROUP BY regweek;