Difference between revisions of "SELECT"
From SQLZOO
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===See also:=== | ===See also:=== | ||
| − | *[[SELECT Tutorial]] | + | *[[SELECT Tutorial]] - practice using the SELECT command |
| − | *[[SELECT ... WHERE]] | + | *[[SELECT ... WHERE]] - the WHERE clause allows you to get some rows but not others |
Revision as of 20:39, 17 May 2012
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
schema:scott
The table games shows the year and the city hosting the Olympic Games.
| yr | city |
|---|---|
| 2000 | Sydney |
| 2004 | Athens |
| 2008 | Beijing |
| 2012 | London |
The SELECT statement returns results from a table.
In this example the table is games and the columns are
yr and city.
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);
SELECT yr, city FROM games
See also:
- SELECT Tutorial - practice using the SELECT command
- SELECT ... WHERE - the WHERE clause allows you to get some rows but not others
