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CREATE TABLE things (
id int primary key auto_increment,
id_thing int,
data varchar(64)
);
CREATE TABLE notes (
id int primary key auto_increment,
id_thing int,
note varchar(64),
foreign key (id_thing) references things(id)
);
INSERT INTO things (id_thing, data) VALUES (1, 'Thing 1'), (2, 'Other thing');
INSERT INTO notes (id_thing, note) VALUES
(1, 'Thing 1 note'), (1, 'Thing 1 one more note'),
(2, 'Important note about Other thing');
SELECT things.id_thing, things.data, GROUP_CONCAT(note) notes
FROM things
LEFT JOIN notes USING(id_thing)
GROUP BY things.id_thing, things.data
;
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