Difference between revisions of "CREATE VIEW"

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<h1>CREATE VIEW</h1>
 
<h1>CREATE VIEW</h1>
<p>The table <code>games</code> shows the year and the city hosting the Olympic Games. [http://dissertations.biz/writing-service.php http://dissertations.biz/]</p>
+
<p>The table <code>games</code> shows the year and the city hosting the Olympic Games.</p>
 
<table>
 
<table>
 
<caption align='center'>games</caption>
 
<caption align='center'>games</caption>
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INSERT INTO games VALUES (2004,'Athens');
 
INSERT INTO games VALUES (2004,'Athens');
 
INSERT INTO games VALUES (2008,'Beijing');
 
INSERT INTO games VALUES (2008,'Beijing');
INSERT INTO games VALUES (2012,'London');  
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INSERT INTO games VALUES (2012,'London');
 
</source>
 
</source>
 
The CREATE VIEW names a SELECT query. That query may be used as if it were a table in many contexts.
 
The CREATE VIEW names a SELECT query. That query may be used as if it were a table in many contexts.

Latest revision as of 09:35, 18 December 2012

CREATE VIEW

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

games
yrcity
2004Athens
2008Beijing
schema:scott
 DROP TABLE games;
DROP TABLE old_games;
DROP TABLE og
 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 CREATE VIEW names a SELECT query. That query may be used as if it were a table in many contexts. In this example the VIEW old_games shows those games before 2006.

CREATE VIEW og AS
  SELECT yr,city FROM scott.games
   WHERE yr<2006;
SELECT * FROM og;
CREATE VIEW og AS
  SELECT yr,city FROM games
   WHERE yr<2006;
SELECT * FROM og;

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