Difference between revisions of "CREATE VIEW"

From SQLZOO
Jump to: navigation, search
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</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,

Revision as of 11:40, 17 July 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
 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 old_games AS
  SELECT yr,city FROM scott.games
   WHERE yr<2006;
SELECT * FROM old_games;
CREATE VIEW old_games AS
  SELECT yr,city FROM games
   WHERE yr<2006;
SELECT * FROM old_games;

See also

Personal tools
Namespaces

Variants
Actions
Reference
Toolbox
Google AdSense