Get most common value for each value of another column in SQL

Question

I have a table like this:

 Column  | Type | Modifiers 
---------+------+-----------
 country | text | 
 food_id | int  | 
 eaten   | date | 

<

Answer 1

It is now even simpler: PostgreSQL 9.4 introduced the mode() function:

select mode() within group (order by food_id)
from munch
group by country

returns (like user2247323's example):

country | mode
--------------
GB      | 3
US      | 1

See documentation here: https://wiki.postgresql.org/wiki/Aggregate_Mode

https://www.postgresql.org/docs/current/static/functions-aggregate.html#FUNCTIONS-ORDEREDSET-TABLE