MySQL query with DISTINCT keyword

Question

My MySQL table country_phone_codes looks something like this

id     country_code     area_code     name
---------------------------------------------------------         


        

Answer 1

Seems like you have a one-to-many relationship between country_code and name.

If you do a simple GROUP BY query like

SELECT country_code,name FROM country_phone_codes GROUP BY country_code

you might end up with

country_code    name
-----------------------------
93            |  AFGHANISTAN
355           |  ALBANIA
213           |  ALGERIA
124           |  COUNTRY - MOBILE
-----------------------------

assuming all your country names are

COUNTRY
COUNTRY - SOMETHING
COUNTRY - SOMETHING - SOMETHING

would be better to use

SELECT country_code,MIN(name) FROM country_phone_codes GROUP BY country_code

so you end up with

country_code    name
-----------------------------
93            |  AFGHANISTAN
355           |  ALBANIA
213           |  ALGERIA
xxx           |  COUNTRY
-----------------------------

this is assuming that you have both of those records in your table

id     country_code     area_code     name
------------------------------------------------------------
xx   |   xxx          |  xx        |  COUNTRY
xx   |   xxx          |  xx        |  COUNTRY - SOMETHING
------------------------------------------------------------