is there a length limit to group_concat or another reason why it would not work on a text field

Question

First, here is the query:

SELECT GROUP_CONCAT(title) title, GROUP_CONCAT(description) description,
skill_id, count(*)

FROM jobs j
INNER JOIN job_feed_detail         


        

Answer 1

The group_concat result length is limited(truncated) to the value of the group_concat_max_len system variable. The default value of this variable is 1024.

If you want change the value of the variable the syntax is:

SET [GLOBAL | SESSION] group_concat_max_len = val;

More info Mysql 5 docs