MySQL split and join the values

Question

I have a table [mapping] with 2 columns similar to below

id  | values
1   | 1,2
2   | 1,2,3
3   | 1,1
4   | 1,1,2

and another table [map] is si

Answer 1

SELECT
    `ids`.`id`,
    GROUP_CONCAT(`values`.`texts`) AS texts
FROM
    `ids`
INNER JOIN `values` ON FIND_IN_SET(`values`.`id`, `ids`.`values`)
GROUP BY
    `ids`.`id`

It works like this: Example

Answer 2

You can use MySQL FIND_IN_SET() to join the tables and GROUP_CONCAT() to concat the values :

SELECT s.sno,GROUP_CONCAT(s.values) as `values` 
FROM mapping t
INNER JOIN map s ON(FIND_IN_SET(s.id,t.values))
GROUP BY s.sno

Note: You should know that this is a very bad DB structure. This may lead to a lot more complicated queries and will force you to over complicate things. You should Normalize your data, split it , and place each ID in a separate record!