My table in Mysql is like this:
IP ID area
aaa A I
aaa A I
aaa B I
aaa C II
bbb A I
bbb B III
ccc B I
Now I want to calculate for each area value, how many different (IP, ID) pairs are there?
How can I use both IP and ID as a whole dataset to do this?
I don't think the following query is correct:
SELECT area, count (distinct IP, ID) from video GROUP BY area ORDER BY COUNT (distinct ip, ID)
So does anyone know how to do it?
SELECT count(*), CONCAT_WS(' ',IP,ID) as yourTitle FROM video GROUP BY yourTitle
应该做
SELECT area, count(*) as distinctCount FROM
(SELECT DISTINCT IP, ID, area FROM video) distinctVideos
GROUP BY area
ORDER BY count(*)
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