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I'm not a DB expert but i'm trying to get time wise user online count to show in a graph. I have manage to get online user count for current time but how to get for a time span ? i need each minute online user count.

here is my query so far

select count(*) from connectivity_log cl inner join (
select cl2.socket_client_id,max(cl2.date_time) as MaxDate from 
connectivity_log cl2 group by cl2.socket_client_id 
) cl3 on cl.socket_client_id = cl3.socket_client_id and 
cl3.MaxDate=cl.date_time and cl.connected=true

Here is my table structure

enter image description here

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