题解 | #删除记录(二)#

删除记录(二)

https://www.nowcoder.com/practice/964c9f7fffbb4ab18b507cfed4111b4a

DELETE  
FROM exam_record
WHERE
`submit_time` IS NULL OR IFNULL(TIMESTAMPDIFF(SECOND,start_time,submit_time),0)<300
ORDER BY `start_time` ASC
LIMIT 3

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