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CREATE [ OR REPLACE]
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VIEW view_name [(column_list)]
AS select_statement
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view_nameã¯ãäœæãããã¥ãŒã®ååã§ãã select_statement-ãã¥ãŒã«å«ãŸããããŒãã«ããã¥ãŒããããŒã¿ãéžæããSELECTã¹ããŒãã¡ã³ã
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CREATE VIEW v AS SELECT a.id, b.id FROM a,b;
* This source code was highlighted with Source Code Highlighter .
CREATE VIEW v (a_id, b_id) AS SELECT a.id, b.id FROM a,b;
* This source code was highlighted with Source Code Highlighter .
CREATE VIEW v AS SELECT a.id a_id, b.id b_id FROM a,b;
* This source code was highlighted with Source Code Highlighter .
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CREATE VIEW v AS SELECT group_concat( DISTINCT column_name oreder BY column_name separator '+' ) FROM table_name;
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ã°ã«ãŒã颿°ã®ãã¹ãã䜿çšãããŠããããããã®ã¯ãšãªãå®è¡ãããšãšã©ãŒãERROR 1111ïŒHY000ïŒïŒInvalid USE of GROUP functionããçºçããŸããSELECT MAX ( count (*)) FROM topics GROUP BY forum_id;
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SELECT MAX (num) FROM tmp_table;
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punbb > CREATE OR REPLACE VIEW v AS
-> SELECT forum_name, `subject`, num_views FROM topics,forums f
-> WHERE forum_id=f.id AND num_views>2000 WITH CHECK OPTION ;
Query OK, 0 rows affected (0.03 sec)
punbb > SELECT * FROM v WHERE subject= 'test' ;
+------------+---------+-----------+
| forum_name | subject | num_views |
+------------+---------+-----------+
| | test | 3000 |
+------------+---------+-----------+
1 row IN SET (0.03 sec)
punbb > UPDATE v SET num_views=2003 WHERE subject= 'test' ;
Query OK, 0 rows affected (0.03 sec)
Rows matched: 1 Changed: 0 WARNINGS: 0
punbb > SELECT * FROM v WHERE subject= 'test' ;
+------------+---------+-----------+
| forum_name | subject | num_views |
+------------+---------+-----------+
| | test | 2003 |
+------------+---------+-----------+
1 row IN SET (0.01 sec)
punbb > SELECT subject, num_views FROM topics WHERE subject= 'test' ;
+---------+-----------+
| subject | num_views |
+---------+-----------+
| test | 2003 |
+---------+-----------+
1 rows IN SET (0.01 sec)
* This source code was highlighted with Source Code Highlighter .
ãã ããnum_viewså€ã2000æªæºã«èšå®ããããšãããšãæ°ããå€ã¯ãã¥ãŒå®çŸ©ã®WHERE num_views> 2000æ¡ä»¶ãæºããããæŽæ°ã¯çºçããŸããã
punbb > UPDATE v SET num_views=1999 WHERE subject= 'test' ;
ERROR 1369 (HY000): CHECK OPTION failed 'punbb.v'
* This source code was highlighted with Source Code Highlighter .
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punbb > INSERT INTO v (subject,num_views) VALUES ( 'test1' ,4000);
ERROR 1369 (HY000): CHECK OPTION failed 'punbb.v'
* This source code was highlighted with Source Code Highlighter .
çç±ã¯ãforum_idåã®ããã©ã«ãå€ã0ã§ããããã远å ãããè¡ããã¥ãŒå®çŸ©ã®WHEREæ¡ä»¶forum_id = f.idãæºãããªãããã§ãã ãã¥ãŒå®çŸ©ã«ãã®ãããªãã£ãŒã«ãããªããããforum_idã®å€ãæç€ºçã«ç€ºãããšã¯ã§ããŸããã
punbb > INSERT INTO v (forum_id,subject,num_views) VALUES (1, 'test1' ,4000);
ERROR 1054 (42S22): Unknown COLUMN 'forum_id' IN 'field list'
* This source code was highlighted with Source Code Highlighter .
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punbb > INSERT INTO v (forum_name) VALUES ( 'TEST' );
Query OK, 1 row affected (0.00 sec)
* This source code was highlighted with Source Code Highlighter .
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