Difference between revisions of "SELECT"
|(4 intermediate revisions by 2 users not shown)|
Revision as of 15:49, 5 February 2014
A SELECT statement gets data from a table. Each table contains rows and columns - you can SELECT some columns and ignore others
- The column names on the select line control which columns you get
- The FROM clause controls which table you access
games shows the year and the city hosting the Olympic Games.
The SELECT statement returns results from a table.
In this example the table is
games and the columns are
DROP TABLE games; DROP TABLE games CASCADE;
CREATE TABLE games(yr INT, city VARCHAR(20),y1 INT); INSERT INTO games(city,yr) VALUES ('Sydney',2000); INSERT INTO games(city,yr,y1) VALUES ('Athens',2004,2000); INSERT INTO games(city,yr,y1) VALUES ('Beijing',2008,2004); INSERT INTO games(city,yr,y1) VALUES ('London',2012,2008);
SELECT yr, city FROM games