Select Count of ip and Count of DISTINCT ip in same query

问题

I have a table structure like this:

TABLE NAME : counter

id  |        datetime       |  url  | ip
-------------------------------------------
1   |2013-04-12 13:27:09    | url1  | ip01
2   |2013-04-13 10:55:43    | url2  | ip02
3   |2013-04-14 11:14:12    | url1  | ip03
4   |2013-04-15 23:23:55    | url2  | ip04
5   |2013-05-02 08:34:44    | url1  | ip03

With a smart SELECT query, I want to fetch 3 columns that are:

Distinct URL    |    count of ip            |    count of distinct ip
                |    for each distinct url  |    for each distinct url  
-------------------------------------------------------------------
url1            |    3                      |    2    
url2            |    2                      |    2

I came up with my query below by the help of this solution in stackoverflow which gives me the first 2 columns that I need:

SELECT url, COUNT(*) AS total_ip FROM counter GROUP BY url ORDER BY total_ip DESC

But how can I add the 3rd column also into my query?

Can you please help me?

回答1:

As you mentioned yourself, you can use DISTINCT keyword to get distinct URLs. Use COUNT to get count of IP and COUNT(DISTINCT ID) to get distinct IP for each URLs

Try this:

SELECT DISTINCT URL AS D_URL
      ,COUNT(IP) AS IP
      ,COUNT(DISTINCT IP) AS D_IP
FROM counter
GROUP BY URL

Output:

╔═══════╦════╦══════╗
║ D_URL ║ IP ║ D_IP ║
╠═══════╬════╬══════╣
║ url1  ║  3 ║    2 ║
║ url2  ║  2 ║    2 ║
╚═══════╩════╩══════╝

See this SQLFiddle

来源：https://stackoverflow.com/questions/16337092/select-count-of-ip-and-count-of-distinct-ip-in-same-query

标签

mysql

sql

count

group-by

distinct