Question

I have a query in which I would like to return the number of users who have logged in for the month without repeating the record in the next month.

If a user has logged in April and May, it only shows one record for April. This is what I have so far.

SELECT DISTINCT (a.userid), EXTRACT(MONTH FROM a.loginTime) as month 
FROM login_audit a LEFT JOIN user u on u.userid = a.userid 
WHERE a.loginTime <= '2012-12-31 11:59:59' 
AND a.loginTime >= '2012-01-01 00:00:00' 
GROUP BY month 

So far the records are returning

userid    month
1        1
2        1
1        2
3        2

In this scenario, user 1 is coming up for both January and Februray. I would like it to ommit that record. Either that or have it accumulated. Like so:

Either

userid    month
1        1
2        1
3        2

Or

userid    month
1        1
2        1
1        2
2        2
3        2

I hope this made sense. Please ask me anything if you’d like any further clarifications. Thanks a lot!

Answer 1

Don’t see where you need table user…

For first “wanted scenario” :

SELECT 
  a.userid, 
  MIN(EXTRACT(MONTH FROM a.loginTime)) as month 
FROM login_audit a
WHERE a.loginTime <= '2012-12-31 11:59:59' AND a.loginTime >= '2012-01-01 00:00:00'
GROUP BY a.userid