计数无法在group_concat MySQL内部工作

Question

I am trying to concat count of id and 1 inside group_concat. Below is my query.

MYSQL:

SELECT
months.name AS NAME,
CONCAT(
    '[',
    GROUP_CONCAT(
        CONCAT(
            '[\"',
            COUNT(p_c_n_details.JPN_ID),
            '\",',
            1,
            ']'
        )
    ),
    ']'
) AS DATA
FROM
p_c_n_details
INNER JOIN in_e_s_s__p_c_ns RIGHT OUTER JOIN months ON months.id = 
MONTH(p_c_n_details.created_at) AND p_c_n_details.type IN('Process Change', 
'Design Change') AND p_c_n_details.JPN_ID = 
in_e_s_s__p_c_ns.juniperinternalpcnid AND p_c_n_details.created_at >= 
last_day(NOW()) + INTERVAL 1 DAY - INTERVAL 3 MONTH
WHERE
months.name IN(
    MONTHNAME(
        DATE_SUB(CURDATE(), INTERVAL 0 MONTH)),
        MONTHNAME(
            DATE_SUB(CURDATE(), INTERVAL 1 MONTH)),
            MONTHNAME(
                DATE_SUB(CURDATE(), INTERVAL 2 MONTH))
            )
        GROUP BY
            months.id

Expected Output:

Name   |     DATA
-------------------------
July        [20,1]
August       [33,1]

Table months contains month names.

But I am getting error #1111 - Invalid use of group function. I tried this link mysql group_concat with a count inside? but I am facing error when using in my query.

Answer 1

This is a guess.

Try:

SELECT months.name AS NAME,
      CONCAT('{',COUNT(p_c_n_details.JPN_ID),',1}' AS DATA

in place of the SELECT you now have.

Your example result doesn't show a need for GROUP_CONCAT() .