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;

Which produced:

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

My desired output would look like this:

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

Answer 1

Check this

SELECT GROUP_CONCAT(id)  FROM table_level where parent_id=4 group by parent_id;