SELECT .. GROUP BY

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	Australia
2004	Athens	Europe
2008	Beijing	Asia
2012	London	Europe

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.

schema:scott

DROP TABLE games

CREATE TABLE games(

  yr INTEGER PRIMARY KEY,
  city VARCHAR(10),
  continent VARCHAR(10);

INSERT INTO games VALUES (

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

See also

• SUM and COUNT
• SELECT WHERE