如何计算SQL数据库中的记录？

Question

I know how to get the number of rows using mysql_num_rows. What i want to do is count each ip address, so i can count how many diffrent ip addresses are in my db. if that makes sense lol. cause there is just over 1,000 records. so let me show you a quick example.

say i have these ip addresses.

127.0.0.1
127.0.0.1
127.0.0.1
127.0.0.2
127.0.0.2
127.0.0.3
127.0.0.3

i want it to count 1 of each. and print 3 or whatever ammount i have in my database not count all which is what mysql_num_rows does and prints 7.

sorry if the title isn't very specific.

Answer 1

一起使用非distinct和count功能：

SELECT COUNT(distinct ip_address) FROM some_table;

Answer 2

Use DISTINCT to count once. Not involving the duplicates. Try this query:

SELECT COUNT(DISTINCT IP) 
FROM table_name;

Answer 3

使用MySQL Distinct子句

SELECT DISTINCT IpAddress FROM MyTable

Answer 4

SELECT ip , COUNT(ip)
FROM table_name GROUP BY ip