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The table
games
shows the year and the city hosting the Olympic Games.
games
yr
city
2000
Sydney
2004
Athens
2008
Beijing
2012
London
When you create an index you make it faster to find a particular row. You can also make the JOIN operator faster.
CREATE INDEX gamesIdx ON games(city,yr); SELECT yr, city FROM games
DROP VIEW old_games; DROP INDEX gamesIdx; DROP TABLE games;
CREATE TABLE games(yr INT, city VARCHAR(20)); INSERT INTO games(city,yr) VALUES ('Sydney',2000); INSERT INTO games(city,yr) VALUES ('Athens',2004); INSERT INTO games(city,yr) VALUES ('Beijing',2008); INSERT INTO games(city,yr) VALUES ('London',2012);
CREATE INDEX gamesIdx ON games(city,yr); SELECT yr, city FROM games
Results
See also:
SELECT Tutorial
SELECT ... WHERE