如何在MySQL中将单列中的姓氏和名字分成两个新列？
为此，请使用SUBSTRING_INDEX()和REPLACE()。让我们首先创建一个表-
mysql> create table DemoTable (Name varchar(100));
使用insert命令在表中插入一些记录。在这里，我们插入了姓氏和名字-
mysql> insert into DemoTable values('Chris | Bob Brown');
mysql> insert into DemoTable values('Carol | Robert Taylor');
mysql> insert into DemoTable values('Sam | David Miller');使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+-----------------------+ | Name | +-----------------------+ | Chris | Bob Brown | | Carol | Robert Taylor | | Sam | David Miller | +-----------------------+ 3 rows in set (0.00 sec)
以下是在MySQL中将姓氏和名字分成两个新列的查询-
mysql> SELECT REPLACE(Name, SUBSTRING_INDEX(Name, ' ', -1),'') AS FirstName, SUBSTRING_INDEX(Name, ' ', -1) AS LastName from DemoTable;
这将产生以下输出-
+-----------------+----------+ | FirstName | LastName | +-----------------+----------+ | Chris | Bob | Brown | | Carol | Robert | Taylor | | Sam | David | Miller | +-----------------+----------+ 3 rows in set (0.00 sec)