mysql - Customer Retention Query - Help needed -

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i having table named users. trying calculate daily retention rate. field of users table :-

id || email|| current_sign_in_at || last_sign_in_at || sign_in_count

i trying calculate number of users retaining in past 24 hours. (definition of retained user - user has sign in count =2 within last 24 hours) so, query this

    select  count(*), date(last_sign_in_at) users last_sign_in_at                                                     between '2015-09-30' , '2015-10-22' , sign_in_count = '2'     group date(last_sign_in_at)

gives me results in following way

count(*) || date(last_sign_in_at)

659      01/10/2015 492     02/10/2015 360     03/10/2015 421     04/10/2015 535     05/10/2015 641     06/10/2015 657     07/10/2015

so, ideally let's on 2nd 492 users users retained out of 659 users first day. till 4th day fine, increases doesn't make sense. doing wrong here? primary objective calculate users have logged in twice in 24 hours time period. so, can make out if x users logged in 1 day , y users out of x users logged in day i.e. y% of x users retaining.


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