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CREATE TABLE `a` ( `a1` int(20) NOT NULL, `a2` varchar(100) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- INSERT INTO `a` (`a1`, `a2`) VALUES (1, 'X'), (2, 'Z'), (3, 'X'), (4, 'Y'), (5, 'Z'), (6, 'X'), (7, 'Y'); select * from a order by a1; UPDATE a SET CASE WHEN a2 = "X" AND (a1 + 1) = (a2 = "Z") THEN a2 = "Y" END; select * from a order by a1;
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