如何计算非连续行之间经过的时间?
我有一张桌子,如下所示:
CREATE TABLE useraudit(
`id` INT NOT NULL AUTO_INCREMENT,
`event` INT(1) unsigned,
`datetime` DATETIME,
`computer` VARCHAR(24) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci,
`username` VARCHAR(15) CHARACTER SET utf8mb4 C...