问题:

So i have database with a table called users.. and in that table there is a column named IP and i want to find users with the same IP and ban them.. So how can a search the datebase for IP's are the same?

回答1:

You should leverage the group by query. An old blog I wrote is Understanding group bys

But basically this should work:

select distinct ip, count(id) from users group by IP having count(id) > 1

This will return all ip addresses with a count of > 1

回答2:

Run a SQL statement and substitute for the IP address you want to search for:

SELECT * FROM users WHERE IP = '172.0.0.1'

回答3:

You can start by:

SELECT count(id) FROM tablename
GROUP BY IP

Then you just join those results back onto the table to get information about the duplicates

So modify the first statement with: SELECT count(id) as number, IP FROM tablename

Then

   SELECT a.id, a.name FROM tablename a
   JOIN (
        SELECT count(id) as number, IP FROM tablename
    ) b ON a.IP = b.IP
    WHERE number > 1

This should give you all the duplicate IP addresses in the Database. You may have to figure out a way to decide on which account to keep and which to remove, but this should give you a start.