MySQL-每天每个IP最多统计1次唯一视图

Question

I'm trying to get unique views per IP, counted max 1 time per day returned using a MySQL query.

The table is looking like this:

product_id          time          ip
INT                 TIMESTAMP     VARCHAR

The query should return the unique views for any time, but it should filter product id's so each product have it's own unique views field counted. The IP-address in the table should be counted MAX once per day. I'll give you some details what should and should not be counted in the query below:

product_id          DATE(time)          ip            should_be_counted
11                  2012-12-14          1.1.1.1       YES
11                  2012-12-14          1.1.1.2       YES
11                  2012-12-14          1.1.1.1       NO
11                  2012-12-13          1.1.1.1       YES
11                  2012-12-13          1.1.1.1       NO

Should be returned:
product_id          unique_views
11                  3

This is what I want:

product_id          unique_views
11                  103
8                   53
2                   3
1                   1

Which means that the query should use ORDER BY unique_views DESC.

Thanks for helping!

Answer 1

SELECT Product_ID, SUM(unique_view) unique_views
FROM
(
  SELECT Product_ID, COUNT(DISTINCT IP)  unique_view
  FROM   tableName
  GROUP BY Product_ID, DATE(time)
) x
GROUP BY Product_ID

• SQLFiddle Demo