comma separated string of selected values in mysql

Question

I want to convert selected values into a comma separated string in MySQL. My initial code is as follows:

SELECT id FROM table_level where parent_id=4;
         


        

Answer 1

Use group_concat() function of mysql.

SELECT GROUP_CONCAT(id) FROM table_level where parent_id=4 GROUP BY parent_id;

It'll give you concatenated string like :

5,6,9,10,12,14,15,17,18,779