SELECT .. GROUP BY

Host cities and continents for the Olympics Games are stored in the table games. Notice that Europe appears in the table twice:

**games**
yr	city	continent
2000	Sydney	Australasia
2004	Athens	Europe
2008	Beijing	Asia
2012	London	Europe
2016	Rio	South America

schema:scott

 DROP TABLE games

 CREATE TABLE games(
  yr INTEGER,
  city VARCHAR(20),
  continent VARCHAR(20));
INSERT INTO games VALUES (2000,'Sydney','Australasia');
INSERT INTO games VALUES (2004,'Athens','Europe');
INSERT INTO games VALUES (2008,'Beijing','Asia');
INSERT INTO games VALUES (2012,'London','Europe');
INSERT INTO games VALUES (2016,'Rio','South America');

In a GROUP BY statement only distinct values are shown for the column in the GROUP BY. This example shows the continents hosting the Olympics with the count of the number of games held.

SELECT continent, COUNT(yr) FROM scott.games
 GROUP BY continent

SELECT continent, COUNT(yr) FROM games
 GROUP BY continent