问题
I have a Drupal site which has a table that keeps track of users. What I want to do is graph membership growth over time. So I want to massage mysql into returning something like this:
date | # of users (total who have registered up to the given date)
1/1/2014 | 0
1/2/2014 | 2
1/3/2014 | 10
Where '# of users' is the total number of users that have registered accounts up to the given date (running-total)--NOT the number of users who registered on that particular day (which is trivial to retrieve).
Each row of my {users}
table has a uid
column, a name
column, and a created
(timestamp) column.
So a sample record from my {users}
table would be:
name: John Smith
uid: 526
created: 1365844220
回答1:
Try:
select u.created, count(*)
from (select distinct date(created) created from `users`) u
join `users` u2 on u.created >= date(u2.created)
group by u.created
SQLFiddle here.
回答2:
I ended up using a solution that incorporates variables, based on a Stack Overflow answer posted here. This solution appears to be a bit more flexible and efficient than other answers provided.
SELECT u.date,
@running_total := @running_total + u.count AS count
FROM (
SELECT COUNT(*) AS count, DATE_FORMAT(FROM_UNIXTIME(created), '%b %d %Y') AS date
FROM {users}
WHERE created >= :start_time AND created <= :end_time
GROUP BY YEAR(FROM_UNIXTIME(created)), MONTH(FROM_UNIXTIME(created)), DAY(FROM_UNIXTIME(created))
) u
JOIN (
SELECT @running_total := u2.starting_total
FROM (
SELECT COUNT(*) as starting_total
FROM {users}
WHERE created < :start_time
) u2
) initialize;
Note that the group by, date formatting, and range requirements are simply specifics of my particular project. A more generic form of this solution (as per the original question) would be:
SELECT u.date,
@running_total := @running_total + u.count AS count
FROM (
SELECT COUNT(*) AS count, DATE(FROM_UNIXTIME(created)) AS date
FROM {users}
GROUP BY date
) u
JOIN (
SELECT @running_total := 0
) initialize;
回答3:
Don't know the table structure so adjust the query to you needs
SELECT DATE(created), COUNT(*) AS Users FROM users GROUP BY DATE(created)
When you only want to show the dates having registerd users add
HAVING COUNT(*) > 0
At the and of the query
来源:https://stackoverflow.com/questions/15951146/retrieve-running-total-record-growth-over-time-in-mysql