表:
id brand group
1 adidas 1,2
2 puma 1
3 asianone 1,2,3
我想要什么结果:
id brand group
1 adidias 1
2 adidias 2
3 puma 1
4 asianone 1
5 asianone 2
6 asianone 3
其中 id 是自增的..
最佳答案
SELECT @id:=@id+1 AS id,
`brand`,
`group`
FROM
(SELECT
`id`,
`brand`,
SUBSTRING_INDEX(SUBSTRING_INDEX(`group`, ',', n.digit+1), ',', -1) AS `group`
FROM
Table1
INNER JOIN
(SELECT 0 AS digit
UNION ALL SELECT 1
UNION ALL SELECT 2
UNION ALL SELECT 3
UNION ALL SELECT 4
UNION ALL SELECT 5
UNION ALL SELECT 6) n
ON LENGTH(REPLACE(`group`, ',' , '')) <= LENGTH(`group`)-n.digit
Order by ID,`group`) AS T,(SELECT @id:=0) AS R;
输出
id brand group
1 adidas 1
2 adidas 2
3 puma 1
4 asianone 1
5 asianone 2
6 asianone 3
演示
有关解释,请转到此链接并查看我的回答
关于php - 如何将逗号分隔的字符串转换为单列?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49745359/