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Do a few updates: update t set a = 11 where id = 1; update t set a = 21 where id = 2; update t set a = 12 where id = 1; update t set a = 22 where id = 2; update t set a = 31 where id = 3; update t set a = 23 where id = 2;
update t set a = 11 where id = 1; update t set a = 21 where id = 2; update t set a = 12 where id = 1; update t set a = 22 where id = 2; update t set a = 31 where id = 3; update t set a = 23 where id = 2;