SELECT  table1.id, GROUP_CONCAT(table2.values)
FROM    table1
INNER JOIN
        table2
ON      FIND_IN_SET(table2.id, table1.nos)
GROUP BY
        table1.id

SELECT  table1.id, GROUP_CONCAT(table2.values),GROUP_CONCAT(table2.values)
 FROM table1  INNER JOIN table2 ON
 FIND_IN_SET(table2.id, table1.nos),
 INNER JOIN table2 ON
 FIND_IN_SET(table2.id, table1.nos1),
 GROUP BY table1.id

id:   no              nos1

1     14,15,16        17,18

id     value

14     PHP
15     JAVA
16     C++
17     mysql
18     mysql server

id     no               nos1

1      PHP, JAVA, C++   mysql, mysql server

SELECT  table1.id,
        (
        SELECT  GROUP_CONCAT(table2.values)
        FROM    table2
        WHERE   FIND_IN_SET(table2.id, table1.no)
        ) AS no,
        (
        SELECT  GROUP_CONCAT(table2.values)
        FROM    table2
        WHERE   FIND_IN_SET(table2.id, table1.nos1)
        ) AS nos1
FROM    table1