Difference between revisions of "SELECT .. WHERE"

From SQLZOO
Jump to: navigation, search
(Created page with " <h1>SELECT .. WHERE</h1> <p>The table <code>games</code> shows the year and the city hosting the Olympic Games.</p> <table> <caption align='center'>games</caption> <tr><th al...")
 
(6 intermediate revisions by 3 users not shown)
Line 9: Line 9:
 
<tr><td>2008</td><td align='left'>Beijing</td></tr>
 
<tr><td>2008</td><td align='left'>Beijing</td></tr>
 
<tr><td>2012</td><td align='left'>London</td></tr>
 
<tr><td>2012</td><td align='left'>London</td></tr>
 +
</table>
 
<div class='ht'>
 
<div class='ht'>
The SELECT statement returns results from a table.  
+
<div class=params>schema:games</div>
 +
<source lang=sql class='tidy'> DROP TABLE games</source>
 +
<source lang=sql class='setup'> CREATE TABLE games(
 +
  yr INTEGER PRIMARY KEY,
 +
  city VARCHAR(20));
 +
INSERT INTO games VALUES (2000,'Sydney');
 +
INSERT INTO games VALUES (2004,'Athens');
 +
INSERT INTO games VALUES (2008,'Beijing');
 +
INSERT INTO games VALUES (2012,'London');
 +
</source>
 +
The SELECT statement returns results from a <i>table</i>.  
 
With a WHERE clause only some rows are returned.  
 
With a WHERE clause only some rows are returned.  
In this example shows the year that Athens hosted the Olympic games.  
+
This example shows the year that Athens hosted the Olympic games.
<div class=params>schema:scott</div>
+
 
<source lang='sql' class='def e-oracle'>
 
<source lang='sql' class='def e-oracle'>
 
SELECT yr, city  
 
SELECT yr, city  
FROM gisq.games
+
FROM scott.games
</source>
+
WHERE yr = 2004
 +
</source>  
 
<source lang='sql' class='def'>
 
<source lang='sql' class='def'>
 
SELECT yr, city  
 
SELECT yr, city  
 
FROM games
 
FROM games
 +
WHERE yr = 2004
 
</source>
 
</source>
 
</div>
 
</div>

Revision as of 17:32, 22 January 2013

SELECT .. WHERE

The table games shows the year and the city hosting the Olympic Games.

games
yrcity
2000Sydney
2004Athens
2008Beijing
2012London
schema:games
 DROP TABLE games
 CREATE TABLE games(
  yr INTEGER PRIMARY KEY,
  city VARCHAR(20));
INSERT INTO games VALUES (2000,'Sydney');
INSERT INTO games VALUES (2004,'Athens');
INSERT INTO games VALUES (2008,'Beijing');
INSERT INTO games VALUES (2012,'London');

The SELECT statement returns results from a table. With a WHERE clause only some rows are returned. This example shows the year that Athens hosted the Olympic games.

SELECT yr, city 
FROM scott.games
WHERE yr = 2004
SELECT yr, city 
FROM games
WHERE yr = 2004

See also

Personal tools
Namespaces

Variants
Actions
Reference
Toolbox
Google AdSense