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CREATE TABLE user_attributes (
additional JSON
);
INSERT INTO user_attributes VALUES ('{"surname":"Петров","firsname":"Петр","lastname":"Петрович"}');
SELECT concat(
JSON_UNQUOTE(json_extract(additional,'$.surname')),
JSON_UNQUOTE(json_extract(additional,'$.firsname')),
JSON_UNQUOTE(json_extract(additional,'$.lastname'))
) fullname
FROM `user_attributes`
;
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