Mysql 具有右连接的SQL视图

我必须创建一个视图来显示数据库中订单的概览。概述不需要订单项目，只需要订单id、订单日期、客户名称、订单总额和订单状态。数据库中有两个表，分别包含客户详细信息（一个用于注册用户，一个用于未注册用户）、shop_customer和shop_temp_customer

我需要该视图从相关表中提取客户的名字和姓氏，以便我可以将其显示在我的订单概览页面上

以下是表格结构：

店铺订单：

Column Name             Column Type    Null Default

order_id                int(11)         No  None
order_date              int(255)        No  None
order_customer_id       int(11)         Yes NULL
order_temp_customer_id  int(11)         Yes NULL
order_postage           double(11,2)    No  None
order_discount          double(11,2)    No  None
order_total             double(11,2)    No  None
order_status            tinyint(1)      No  None

order_id order_date order_customer_id order_temp_customer_id order_postage order_discount order_total order_status
1        1322697540 2                 NULL                   12.50         0.00           1012.50     0
2        1322697540 NULL              1                      13.00         0.00           1200.00     1

店铺及顾客：

Column Name               Column Type  Null Default

customer_id               int(11)       No  None
customer_title            varchar(255)  No  None
customer_forename         varchar(255)  No  None
customer_surname          varchar(255)  No  None
customer_company          varchar(255)  No  None
customer_contact_number   varchar(255)  No  None
customer_email            varchar(255)  No  None
customer_password         varchar(255)  No  None
customer_reference        varchar(255)  No  None
customer_marketing        tinyint(1)    No  None
customer_active           tinyint(1)    No  None
customer_decomission_date int(11)       No  None

Column Name                     Column Type    Null Default

temp_customer_id                int(11)         No  None
temp_customer_title             varchar(255)    No  None
temp_customer_forename          varchar(255)    No  None
temp_customer_surname           varchar(255)    No  None
temp_customer_company           varchar(255)    No  None
temp_customer_contact_number    varchar(255)    No  None
temp_customer_email             varchar(255)    No  None
temp_customer_reference         varchar(255)    No  None
temp_customer_decomission_date  int(11)         No  None

商店临时顾客：

Column Name               Column Type  Null Default

customer_id               int(11)       No  None
customer_title            varchar(255)  No  None
customer_forename         varchar(255)  No  None
customer_surname          varchar(255)  No  None
customer_company          varchar(255)  No  None
customer_contact_number   varchar(255)  No  None
customer_email            varchar(255)  No  None
customer_password         varchar(255)  No  None
customer_reference        varchar(255)  No  None
customer_marketing        tinyint(1)    No  None
customer_active           tinyint(1)    No  None
customer_decomission_date int(11)       No  None

Column Name                     Column Type    Null Default

temp_customer_id                int(11)         No  None
temp_customer_title             varchar(255)    No  None
temp_customer_forename          varchar(255)    No  None
temp_customer_surname           varchar(255)    No  None
temp_customer_company           varchar(255)    No  None
temp_customer_contact_number    varchar(255)    No  None
temp_customer_email             varchar(255)    No  None
temp_customer_reference         varchar(255)    No  None
temp_customer_decomission_date  int(11)         No  None

以下是我的视图代码，但它没有拉入任何数据项：

CREATE VIEW shop_order_view_all_preview AS
SELECT o.order_id, o.order_date, c.customer_forename, c.customer_surname, tc.temp_customer_forename, tc.temp_customer_surname, o.order_total, o.order_status
FROM shop_orders o
RIGHT JOIN shop_customers c
ON c.customer_id = o.order_customer_id
RIGHT JOIN shop_temp_customers tc
ON tc.temp_customer_id = o.order_customer_id

有什么想法吗

编辑：

以下是表格中的一些数据：

店铺订单：

Column Name             Column Type    Null Default

order_id                int(11)         No  None
order_date              int(255)        No  None
order_customer_id       int(11)         Yes NULL
order_temp_customer_id  int(11)         Yes NULL
order_postage           double(11,2)    No  None
order_discount          double(11,2)    No  None
order_total             double(11,2)    No  None
order_status            tinyint(1)      No  None

order_id order_date order_customer_id order_temp_customer_id order_postage order_discount order_total order_status
1        1322697540 2                 NULL                   12.50         0.00           1012.50     0
2        1322697540 NULL              1                      13.00         0.00           1200.00     1

店铺(顾客)

customer_id customer_title customer_forename customer_surname customer_company customer_telephone customer_email customer_password                 customer_reference customer_marketing customer_active customer_decomission_date
2           Mr             b                 a                d                 044444            a@test.com     098f6bcd4621d373cade4e832627b4f6  Poster / Flyer     1                  1               0

temp_customer_id temp_customer_title temp_customer_forename temp_customer_surname temp_customer_company temp_customer_contact_number temp_customer_email temp_customer_reference temp_customer_decomission_date
 1               Mr                  e                      asy                   NULL                  04444                        test@test.com       Google                  1322697540

车间温度客户：

customer_id customer_title customer_forename customer_surname customer_company customer_telephone customer_email customer_password                 customer_reference customer_marketing customer_active customer_decomission_date
2           Mr             b                 a                d                 044444            a@test.com     098f6bcd4621d373cade4e832627b4f6  Poster / Flyer     1                  1               0

temp_customer_id temp_customer_title temp_customer_forename temp_customer_surname temp_customer_company temp_customer_contact_number temp_customer_email temp_customer_reference temp_customer_decomission_date
 1               Mr                  e                      asy                   NULL                  04444                        test@test.com       Google                  1322697540

---

尝试使用左连接而不是右连接，因为包含所有订单的表位于左侧：

CREATE VIEW shop_order_view_all_preview
AS
SELECT
  o.order_id,
  o.order_date,
  c.customer_forename,
  c.customer_surname,
  tc.temp_customer_forename,
  tc.temp_customer_surname,
  o.order_total,
  o.order_status
FROM shop_orders o
  LEFT JOIN shop_customers c ON c.customer_id = o.order_customer_id
  LEFT JOIN shop_temp_customers tc ON tc.temp_customer_id = o.order_customer_id

---

这可能无法解决问题，但我会先尝试一下。

尝试使用左连接，而不是右连接，因为包含所有订单的表位于左侧：

CREATE VIEW shop_order_view_all_preview
AS
SELECT
  o.order_id,
  o.order_date,
  c.customer_forename,
  c.customer_surname,
  tc.temp_customer_forename,
  tc.temp_customer_surname,
  o.order_total,
  o.order_status
FROM shop_orders o
  LEFT JOIN shop_customers c ON c.customer_id = o.order_customer_id
  LEFT JOIN shop_temp_customers tc ON tc.temp_customer_id = o.order_customer_id

---

这可能无法解决问题，但我会先尝试一下。最后一行有一个小问题：

CREATE VIEW shop_order_view_all_preview AS
SELECT o.order_id, o.order_date, c.customer_forename, c.customer_surname, tc.temp_customer_forename, tc.temp_customer_surname, o.order_total, o.order_status
FROM shop_orders o
LEFT JOIN shop_customers c
ON c.customer_id = o.order_customer_id
LEFT JOIN shop_temp_customers tc
ON tc.temp_customer_id = o.order_temp_customer_id
--                               ^^^^^

-您正在将订单表中的永久客户id链接到临时客户表，即使订单表中有一个单独的字段用于临时客户id

---

编辑：将右连接更改为左连接-订单表应位于连接的内部。

最后一行有一个小问题：

CREATE VIEW shop_order_view_all_preview AS
SELECT o.order_id, o.order_date, c.customer_forename, c.customer_surname, tc.temp_customer_forename, tc.temp_customer_surname, o.order_total, o.order_status
FROM shop_orders o
LEFT JOIN shop_customers c
ON c.customer_id = o.order_customer_id
LEFT JOIN shop_temp_customers tc
ON tc.temp_customer_id = o.order_temp_customer_id
--                               ^^^^^

-您正在将订单表中的永久客户id链接到临时客户表，即使订单表中有一个单独的字段用于临时客户id

编辑：将右连接更改为左连接-订单表应位于连接的内部。

试试这个

CREATE VIEW shop_order_view_all_preview AS
      SELECT
       shop_orders.order_id, shop_orders.order_date, shop_customers.customer_forename, shop_customers.customer_surname, shop_temp_customers.temp_customer_forename, shop_temp_customers.temp_customer_surname, shop_orders.order_total, shop_orders.order_status
      FROM 
       shop_orders, shop_customers, shop_temp_customers 
      RIGHT JOIN shop_customers 
      ON customer_id = order_customer_id
      AND
      RIGHT JOIN shop_temp_customers
      ON temp_customer_id = order_customer_id

试试这个

CREATE VIEW shop_order_view_all_preview AS
      SELECT
       shop_orders.order_id, shop_orders.order_date, shop_customers.customer_forename, shop_customers.customer_surname, shop_temp_customers.temp_customer_forename, shop_temp_customers.temp_customer_surname, shop_orders.order_total, shop_orders.order_status
      FROM 
       shop_orders, shop_customers, shop_temp_customers 
      RIGHT JOIN shop_customers 
      ON customer_id = order_customer_id
      AND
      RIGHT JOIN shop_temp_customers
      ON temp_customer_id = order_customer_id

---

---

代码似乎很好，您能从表中输入一些数据吗。@PhilFaceplantYoung，第二条

shop\u orders

记录上的

order\u temp\u customer\u id

字段保存了一份

订单日期的副本，不是
shop\u temp\u customer
表中的
temp\u customer\u id
值-这是否准确反映了您的数据？它确实反映了，更正了现在发布的代码。ty:）订单表中的
order\u customer\u id
和
order\u temp\u customer\u id
不能都有非空值？谢谢wildplasser，这已经更新了。代码看起来不错，你能从表中输入一些数据吗。@PhilFaceplantYoung，第二条
shop\u orders
记录上的
order\u temp\u customer\u id
字段保存的是
order\u日期的副本，而不是
shop\u temp\u customer\u id
表中的
temp\u customer\u id
值-这是否准确地反映了您的数据？它确实反映了，现在发布了更正的代码。ty:）订单表中的
order\u customer\u id
和
order\u temp\u customer\u id
不能都有非空值？感谢wildplasser，该表已更新，只有在客户未注册时才称为temp，因此，客户和订单将在下单6个月后被删除。@PhilFaceplantYoung：关键是，根据客户是临时客户还是永久客户，在订单表上有单独的客户ID字段。另请参阅我对您的问题的评论。由于客户未注册，表isd仅称为temp，因此该客户和订单将在下单6个月后被删除。@PhilFaceplantYoung:关键是，根据客户ID是临时客户还是永久客户，您的订单表上有单独的字段。另请参阅我对您问题的评论。这将从shop_customers表中提取数据，而不是shop_temp_customer数据。但它会带来一些数据，就在那里+1我已经更新了我的答案，包括左连接-还有连接字段问题。您的连接字段问题是正确的。我假设联接字段是正确的；）这将从shop_customers表中提取数据，而不是shop_temp_customer数据。但它会带来一些数据，就在那里+1我已经更新了我的答案，包括左连接-还有连接字段问题。您的连接字段问题是正确的。我假设联接字段是正确的；）