Difference between revisions of "Main Page/fr"
From SQLZOO
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| − | + | 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 | |
| − | === < | + | <div class=params>schema:scott</div> |
| − | + | The table <code>games</code> shows the year and the city hosting the Olympic Games. | |
| − | + | <table border='1'> | |
| − | <div class= | + | <caption>games</caption> |
| − | + | <tr> <th>yr</th> <th>city</th> </tr> | |
| − | + | <tr> <td align='right'>2000</td> <td>Sydney</td> </tr> | |
| + | <tr> <td align='right'>2004</td> <td>Athens</td> </tr> | ||
| + | <tr> <td align='right'>2008</td> <td>Beijing</td> </tr> | ||
| + | <tr> <td align='right'>2012</td> <td>London</td> </tr> | ||
| + | </table> | ||
| + | <div class=qu> | ||
| + | The SELECT statement returns results from a <i>table</i>. | ||
| + | In this example the table is <code>games</code> and the columns are | ||
| + | <code>yr</code> and <code>city</code>. | ||
| + | <div class=tidy> | ||
| + | DROP TABLE games; | ||
</div> | </div> | ||
| − | <div class=' | + | <div class=setup> |
| − | + | CREATE TABLE games(yr INT, city VARCHAR(20)); | |
| − | + | INSERT INTO games(city,yr) VALUES ('ouroalpha',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); | ||
</div> | </div> | ||
| − | <div class= | + | <div class=def> |
| − | + | SELECT yr, city FROM games | |
| − | + | ||
</div> | </div> | ||
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</div> | </div> | ||
| − | + | ===See also:=== | |
| + | *[http://sqlzoo.net/w/index.php/SELECT_from_BBC_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 09:51, 7 December 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 ('ouroalpha',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 |SELECT ... WHERE] - the WHERE clause allows you to get some rows but not others
