Mysql 如何将结果列拆分为多个列

我有一张像这样的桌子：

id  ip
--  -----------
1   192.168.2.1

需要得到如下结果：

id  ip           A    B    C    D
--  -----------  ---  ---  ---  ---
1   192.168.2.1  192  168  2    1

可行吗

SELECT `id`, `ip`,
    SUBSTRING_INDEX( `ip` , '.', 1 ) AS a,
    SUBSTRING_INDEX(SUBSTRING_INDEX( `ip` , '.', 2 ),'.',-1) AS b,
    SUBSTRING_INDEX(SUBSTRING_INDEX( `ip` , '.', -2 ),'.',1) AS c,
    SUBSTRING_INDEX( `ip` , '.', -1 ) AS d
FROM unicorns

示例

SET @ip = '192.168.1.1';

SELECT @ip,
    SUBSTRING_INDEX( @ip , '.', 1 ) AS a,
    SUBSTRING_INDEX(SUBSTRING_INDEX( @ip , '.', 2 ),'.',-1) AS b,
    SUBSTRING_INDEX(SUBSTRING_INDEX( @ip , '.', -2 ),'.',1) AS c,
    SUBSTRING_INDEX( @ip , '.', -1 ) AS d

结果

| @IP | A | B | C | D | ----------------------------------- | 192.168.1.1 | 192 | 168 | 1 | 1 | |@IP | A | B | C | D| ----------------------------------- |192.168.1.1 | 192 | 168 | 1 | 1 |可能重复见类似问题