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CREATE TABLE `countries` (
`name` VARCHAR(128),
`iso2` CHAR(2) PRIMARY KEY
);
INSERT INTO `countries` VALUES ('Russia', 'ru'), ('Ukraine', 'ua');
CREATE TABLE `links` (
`link_id` INT PRIMARY KEY auto_increment,
`country` CHAR(2),
INDEX (`country`)
);
INSERT INTO `links` (`country`) VALUES ('ua'), ('ru');
WITH countries_links AS (
SELECT JSON_OBJECT('name', `name`, 'iso2', `iso2`, 'links', COUNT(`link_id`)) d
FROM `links`
JOIN `countries` ON `countries`.`iso2` = `links`.`country`
GROUP BY `name`, `iso2`
HAVING COUNT(`link_id`) > 0
) SELECT JSON_ARRAYAGG(d) FROM countries_links
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