MYSQL：mysql中的动态列->名字，姓氏到全名：

Question

I was wondering if you have two columns for lets say

first name. 
last name.

what you store in the database.

Can you create a 'dynamic' column 'fullname' in the database that automatically creates the name out of the first and last name?

firstname   |lastname   |fullname (this goes automatically)
-----------------------------------------
foo         |bar        |foo bar 

Answer 1

If you just want to select the full name, you can do just that:

 select concat(firstname, ' ', lastname) as fullname from users

If you actually want a column (ie be able to perform updates against it), then it's not possible, AFAIK.

Answer 2

您可以尝试如下操作：

 SELECT CONCAT(firstname, ' ', lastname) as firstlast FROM users

Answer 3

此操作还确保不添加任何空格：

SELECT IF(ISNULL(firstname), lastname, CONCAT(firstname, ' ', lastname)) AS fullname FROM users