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Editorial Team
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Asked: 2026-05-26T08:32:57+00:00

I have try almost every tutorial on the internet trying to change group_concat_max_len but

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I have try almost every tutorial on the internet trying to change group_concat_max_len but as file my.ini didnt exist group_concat_max_len in wamp server, and I execute the following querys show variables like ‘group%’; and SET @@group_concat_max_len = 9999999; but It say any rows affected how can I fix that? I dont find a solution please help

I already do a query but I does not work It returns blob

SET GLOBAL group_concat_max_len=4096;
SELECT correo_id_correo, GROUP_CONCAT(destinatario_id_usuario SEPARATOR ',') FROM correo_has_usuario GROUP BY correo_id_correo;
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1 Answer

  1. Editorial Team

    According to the manual page for GROUP_CONCAT():

    The result type is TEXT or BLOB unless group_concat_max_len is less
    than or equal to 512, in which case the result type is VARCHAR or
    VARBINARY.

    So increasing group_concat_max_len will not return VARCHAR or VARBINARY. You’d need to decrease it.

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