Question

I have a table called visitors which contains IP and country columns.

Now I want to query the table such that I get unique countries from the table and display the count of rows of that country.

Table:

IP         Country 
1.1.1.1.    xyz 
1.2.3.4     xyz
2.2.3.6     abc
3.61.3.69   axy

Now I want the result as :

Country     No_Visitors
xyz               2
abc               1
axy               1

I know how to do it by using 2 queries, get the unique country first and then again query the table for the country name. But how can I do it with single query.

Answer 1

use AGGREGATE FUNCTION COUNT() to get the total number of instances for each country.

SELECT Country, COUNT(IP)
FROM tableName
GROUP BY Country

SQLFiddle Demo