MySQL - SELECT the name that comes first alphabetically

Question

I have started to learn MySQL.

Here is the table world:

+-------------+-----------+---------+
|    name     | continent |  area   |
+--         


        

Answer 1

what about this sql :

select distinct continent, 
      (select name 
       from world y where y.continent = x.continent limit 1 ) as name 
from world x

Answer 2

If you need list each continent alphabetically, you have use

     SELECT * from world ORDER by continent

But, If you nedd list each country your have use

     SELECT * from world ORDER by name

Answer 3

This is a simple aggegation:

SELECT continent, MIN(name) AS name
FROM world 
GROUP BY continent
ORDER by continent

Answer 4

Select distinct continent, name from world x 
where name <=All (Select name from world y where x.continent=y.continent)

Answer 5

The SqlZoo solution would better look like this:

SELECT continent, name FROM world x
WHERE name <= ALL
  (SELECT name FROM world y WHERE y.continent=x.continent)