mysql随机抽取一条数据

SELECT * FROM pet_diary AS t1 JOIN (SELECT ROUND(RAND() * ((SELECT MAX(pet_did) FROM pet_diary)-(SELECT MIN(pet_did) FROM pet_diary))+(SELECT MIN(pet_did) FROM pet_diary)) AS pet_did) AS t2 WHERE t1.pet_did >= t2.pet_did ORDER BY t1.pet_did LIMIT 1;

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