using group_concat in PHPMYADMIN will show the result as [BLOB - 3B]

Question

I have a query which uses the GROUP_CONCAT of mysql on an integer field.
I am using PHPMYADMIN to develop this query. My problem that instead of showing 1,2 which is the

Answer 1

According to the MySQL documentation, CAST(expr AS type) is standard SQL and should thus be perferred. Also, you may omit the string length. Therefore, I’d suggest the following:

SELECT rec_id, GROUP_CONCAT(CAST(user_id AS CHAR))
FROM t1
GROUP BY rec_id