i've used GROUP_CONCAT to get results splitted by comma ( ,
), but when i saw, the GRUP_CONCAT
returned only 205 splitted numbers, but in the database there's 2448 results (different aid
). Here is my query:
SELECT GROUP_CONCAT(`aid`) As favoriti
FROM `z_web_favoriti`
WHERE `kup_id`='1' AND `pos_id`='571'
When i execute:
SELECT DISTINCT `aid`
FROM `z_web_favoriti`
WHERE `kup_id`='1' AND `pos_id`='571'
I get the following result: Showing rows 0 - 29 (2448 total,..)
Anyone has some solution why it isn't working? I've searched on stackoverflow for similar problem, but i couldn't find it..
Probably you have exceeded GROUP_CONCAT maximum length.
The result is truncated to the maximum length that is given by the group_concat_max_len system variable, which has a default value of 1024. The value can be set higher, although the effective maximum length of the return value is constrained by the value of max_allowed_packet. The syntax to change the value of group_concat_max_len at runtime is as follows, where val is an unsigned integer:
SET [GLOBAL | SESSION] group_concat_max_len = val;
By default, the maximum length for group_concat()
is 1,024.
You can change this to a larger value by changing the value of the system variable group_concat_max_len
.
The documentation explains this.
Please try below code.
SET GLOBAL group_concat_max_len=15000;
SELECT GROUP_CONCAT(`aid`) As favoriti
FROM `z_web_favoriti`
WHERE `kup_id`='1' AND `pos_id`='571'
Hope this will helps.
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