Difference between revisions of "CREATE VIEW"

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(Created page with " <h1>CREATE VIEW</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 align=...")
 
 
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Line 10: Line 10:
 
<div class='ht'>
 
<div class='ht'>
 
<div class=params>schema:scott</div>
 
<div class=params>schema:scott</div>
<source lang=sql class='tidy'> DROP TABLE games</source>
+
<source lang=sql class='tidy'> DROP TABLE games;
 +
DROP TABLE old_games;
 +
DROP TABLE og</source>
 
<source lang=sql class='setup'> CREATE TABLE games(
 
<source lang=sql class='setup'> CREATE TABLE games(
 
   yr INTEGER PRIMARY KEY,
 
   yr INTEGER PRIMARY KEY,
Line 22: Line 24:
 
In this example the VIEW old_games shows those games before 2006.  
 
In this example the VIEW old_games shows those games before 2006.  
 
<source lang='sql' class='def e-oracle'>
 
<source lang='sql' class='def e-oracle'>
CREATE VIEW old_games AS
+
CREATE VIEW og AS
 
   SELECT yr,city FROM scott.games
 
   SELECT yr,city FROM scott.games
 
   WHERE yr<2006;
 
   WHERE yr<2006;
SELECT * FROM old_games;
+
SELECT * FROM og;
 
</source>  
 
</source>  
CREATE VIEW old_games AS
+
<source lang='sql' class='def'>
 +
CREATE VIEW og AS
 
   SELECT yr,city FROM games
 
   SELECT yr,city FROM games
 
   WHERE yr<2006;
 
   WHERE yr<2006;
SELECT * FROM old_games;
+
SELECT * FROM og;
 
</source>
 
</source>
 
</div>
 
</div>

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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