mysql视图之管理视图实例详解【增删改查操作】

SHOW CREATE VIEW [database_name].[view_ name];

CREATE VIEW organization AS
  SELECT 
    CONCAT(E.lastname, E.firstname) AS Employee,
    CONCAT(M.lastname, M.firstname) AS Manager
  FROM
    employees AS E
      INNER JOIN
    employees AS M ON M.employeeNumber = E.ReportsTo
  ORDER BY Manager;

mysql> SELECT * FROM organization;
+------------------+------------------+
| Employee     | Manager     |
+------------------+------------------+
| BondurLoui    | BondurGerard   |
| CastilloPamela  | BondurGerard   |
| JonesBarry    | BondurGerard   |
| HernandezGerard | BondurGerard   |
.......此处省略了many many数据.......
| KatoYoshimi   | NishiMami    |
| KingTom     | PattersonWilliam |
| MarshPeter    | PattersonWilliam |
| FixterAndy    | PattersonWilliam |
+------------------+------------------+
24 rows in set

SHOW CREATE VIEW organization;

ALTER
 [ALGORITHM = {MERGE | TEMPTABLE | UNDEFINED}]
 VIEW [database_name]. [view_name]
  AS
 [SELECT statement]

ALTER VIEW organization
 AS 
 SELECT CONCAT(E.lastname,E.firstname) AS Employee,
     E.email AS employeeEmail,
     CONCAT(M.lastname,M.firstname) AS Manager
 FROM employees AS E
 INNER JOIN employees AS M
  ON M.employeeNumber = E.ReportsTo
 ORDER BY Manager;

CREATE OR REPLACE VIEW v_contacts AS
  SELECT 
    firstName, lastName, extension, email
  FROM
    employees;
-- 查询视图数据
SELECT * FROM v_contacts;

+-----------+-----------+-----------+--------------------------------+
| firstName | lastName | extension | email             |
+-----------+-----------+-----------+--------------------------------+
| Diane   | Murphy  | x5800   | dmurphy@yiibai.com       |
| Mary   | Hill   | x4611   | mary.hill@yiibai.com      |
| Jeff   | Firrelli | x9273   | jfirrelli@yiibai.com      |
| William  | Patterson | x4871   | wpatterson@yiibai.com     |
| Gerard  | Bondur  | x5408   | gbondur@gmail.com       |
| Anthony  | Bow    | x5428   | abow@gmail.com         |
| Leslie  | Jennings | x3291   | ljennings@yiibai.com      |
.............. 此处省略了many many数据 ..................................
| Martin  | Gerard  | x2312   | mgerard@gmail.com       |
| Lily   | Bush   | x9111   | lilybush@yiiibai.com      |
| John   | Minsu   | x9112   | johnminsu@classicmodelcars.com |
+-----------+-----------+-----------+--------------------------------+
25 rows in set

CREATE OR REPLACE VIEW v_contacts AS
  SELECT 
    firstName, lastName, extension, email, jobtitle
  FROM
    employees;
-- 查询视图数据
SELECT * FROM v_contacts;

+-----------+-----------+-----------+--------------------------------+----------------------+
| firstName | lastName | extension | email             | jobtitle       |
+-----------+-----------+-----------+--------------------------------+----------------------+
| Diane   | Murphy  | x5800   | dmurphy@yiibai.com       | President      |
| Mary   | Hill   | x4611   | mary.hill@yiibai.com      | VP Sales       |
| Jeff   | Firrelli | x9273   | jfirrelli@yiibai.com      | VP Marketing     |
................... 此处省略了一大波数据 ....................................................
| Yoshimi  | Kato   | x102   | ykato@gmail.com        | Sales Rep      |
| Martin  | Gerard  | x2312   | mgerard@gmail.com       | Sales Rep      |
| Lily   | Bush   | x9111   | lilybush@yiiibai.com      | IT Manager      |
| John   | Minsu   | x9112   | johnminsu@classicmodelcars.com | SVP Marketing    |
+-----------+-----------+-----------+--------------------------------+----------------------+
25 rows in set

DROP VIEW [IF EXISTS] [database_name].[view_name]

DROP VIEW IF EXISTS organization;