Difference between revisions of "SELECT"

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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
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The table <code>games</code> shows the year and the city hosting the Olympic Games.
<table border='1'>
<tr> <th>yr</th> <th>city</th> <th>y1</th></tr>
<tr> <td align='right'>2000</td> <td>Sydney</td>  <td></td></tr>
<tr> <td align='right'>2004</td> <td>Athens</td> <td>2000</td></tr>
<tr> <td align='right'>2008</td> <td>Beijing</td><td>2004</td> </tr>
<tr> <td align='right'>2012</td> <td>London</td><td>2008</td> </tr>
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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>.
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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);
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SELECT yr, city FROM games
===See also:===
*[[SELECT_basics | 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 04:00, 17 April 2014