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CREATE TABLE `comment` (id int PRIMARY KEY AUTO_INCREMENT, reply_id int, `comment` text); INSERT INTO `comment` (`reply_id`, `comment`) VALUES (null, 'parent'), (1, 'child'), (1, 'child'), (1, 'child'), (null, 'parent'); SELECT * FROM `comment` WHERE (id = 1 AND reply_id IS NULL) OR reply_id = 1;
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