Why mysql query doesn't return 0 when is null -


i'm trying return values 0 when field null. example if there 1 id_articulo importe null, query return 0.

table

create table `pujas` (   `id_puja` int(11) not null auto_increment,   `id_articulo` int(11) default null,   `id_usuario` int(11) default null,   `tiempo` timestamp not null default current_timestamp,   `importe` int(11) default null,   primary key (`id_puja`) ) engine=innodb auto_increment=3 defau  lt charset=latin1;

query

select ifnull(max(importe),0) pujas group id_articulo

enter image description here

you forgot 2nd argument of ifnull() function

select ifnull(max(importe), 0) pujas group id_articulo

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