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create table records(id int, name varchar(100), position int);
insert into records(id, name, position) values
(1, '111', 1),
(2, '111', 2),
(3, '111', 3),
(4, '111', 4),
(5, '111', 5),
(6, '111', 6),
(7, '111', 7),
(8, '111', 8),
(9, '111', 10),
(10, '111', 11),
(11, '111', 12),
(11, '111', 100);
update records set position = (select floor(rand()*(max(position) - min(position))+min(position)) from (select * from records) as t);
select * from records;
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