Question

Simply looking for a better direction, not a solution.

I have two tables – A, B

Table A has ip address and time (time will be either equal to or between starttime and endtime)

Table B has username, starttime, endtime, ip address

The job, I am trying to find out what ip address and time in in table A correspond the username in table B.

More generally, who (username) was using a specific ip address at a specific time.

Assuming my explanation makes sense, does this seem like something using joins can accomplish between the two tables? If not what is the next best step. I am trying to avoid a lot of manual queries from one table to another.

Any direction is welcome, thank you.

Answer 1

Yes, a join is appropriate. The condition needs to be a compound condition that matches both the ip address and the time constraints.

select B.username, A.ipaddress, A.time
 from A inner join B on A.ipaddress = B.ipaddress 
                        and A.time between B.starttime and B.endtime