在MySql中创建视图时如何使用select *和concat

Question

我正在尝试使用sqlfiddle v 5.6或MySQL Workbench v5.7创建视图，以包括来自表CUSTOMERS的所有信息，但将firstName和lastName连接为wholeName。 我尝试使用以下方法：

CREATE VIEW v_customer AS SELECT *,
   CONCAT(CONCAT(lastName, ', '), firstName AS wholeName,
   FROM customers; 

和

CREATE VIEW v_customer AS SELECT customerID,
   CONCAT(CONCAT(lastName, ', '), firstName AS wholeName,
   ...(all other customer columns),
   FROM customers;

省略CONCAT函数时，将创建视图。 它使我相信我的语法有问题，但是错误出现在“ FROM”行。

Answer 1

您可以使用单个concat将两个以上的列或表达式连接在一起。

尝试这个：

create view v_customer as
select *, 
    concat(lastname, ', ', firstname) as wholename,
from customers; 

Answer 2

您应该只合并一个温顺的字符串，只将所有字符串加一个所需的分隔符

  CREATE VIEW v_customer AS SELECT *,
    CONCAT(lastName, ', ', firstName ) AS wholeName,
   FROM customers; 

Answer 3

在收到这些答案之前最终对我有用的代码……也奏效了：

CREATE VIEW v_customer 
AS SELECT customerID,
   CONCAT(customers.firstName, ' ',customers.lastName) AS wholeName,
   street,
   apartment,
   city,
   state,
   zipCode,
   homePhone,
   mobilePhone,
   otherPhone
   FROM CUSTOMERS;