How to use GROUP_CONCAT in a CONCAT in MySQL

Question

If I have a table with the following data in MySQL:

id       Name       Value
1          A          4
1          A          5
1          B          8
2               


        

Answer 1

SELECT id, Group_concat(column) FROM (SELECT id, Concat(name, ':', Group_concat(value)) AS column FROM mytbl GROUP BY id, name) tbl GROUP BY id;