详细分析mysql视图的原理及使用方法

CREATE
 [OR REPLACE]
 [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}]
 [DEFINER = user]
 [SQL SECURITY { DEFINER | INVOKER }]
 VIEW view_name [(column_list)]
 AS select_statement
 [WITH [CASCADED | LOCAL] CHECK OPTION]

create view <视图名称> [(column_list)]
as select语句
with check option;

# 单表视图
mysql> create view v_F_players(编号,名字,性别,电话)
 -> as
 -> select PLAYERNO,NAME,SEX,PHONENO from PLAYERS
 -> where SEX='F'
 -> with check option;
Query OK, 0 rows affected (0.00 sec)
mysql> desc v_F_players;
+--------+----------+------+-----+---------+-------+
| Field | Type  | Null | Key | Default | Extra |
+--------+----------+------+-----+---------+-------+
| 编号 | int(11) | NO |  | NULL |  |
| 名字 | char(15) | NO |  | NULL |  |
| 性别 | char(1) | NO |  | NULL |  |
| 电话 | char(13) | YES |  | NULL |  |
+--------+----------+------+-----+---------+-------+
4 rows in set (0.00 sec)
mysql> select * from v_F_players;
+--------+-----------+--------+------------+
| 编号 | 名字  | 性别 | 电话  |
+--------+-----------+--------+------------+
|  8 | Newcastle | F  | 070-458458 |
|  27 | Collins | F  | 079-234857 |
|  28 | Collins | F  | 010-659599 |
| 104 | Moorman | F  | 079-987571 |
| 112 | Bailey | F  | 010-548745 |
+--------+-----------+--------+------------+
5 rows in set (0.02 sec)
# 多表视图
mysql> create view v_match
 -> as 
 -> select a.PLAYERNO,a.NAME,MATCHNO,WON,LOST,c.TEAMNO,c.DIVISION
 -> from 
 -> PLAYERS a,MATCHES b,TEAMS c
 -> where a.PLAYERNO=b.PLAYERNO and b.TEAMNO=c.TEAMNO;
Query OK, 0 rows affected (0.03 sec)
mysql> select * from v_match;
+----------+-----------+---------+-----+------+--------+----------+
| PLAYERNO | NAME  | MATCHNO | WON | LOST | TEAMNO | DIVISION |
+----------+-----------+---------+-----+------+--------+----------+
|  6 | Parmenter |  1 | 3 | 1 |  1 | first |
|  44 | Baker  |  4 | 3 | 2 |  1 | first |
|  83 | Hope  |  5 | 0 | 3 |  1 | first |
|  112 | Bailey |  12 | 1 | 3 |  2 | second |
|  8 | Newcastle |  13 | 0 | 3 |  2 | second |
+----------+-----------+---------+-----+------+--------+----------+
5 rows in set (0.04 sec)