查询将顺序存储为postgresql中的值

Question

我有这个简单的玩家表

id | name | score | place

我想知道是否有查询可让我按score对玩家进行排序，并根据订单更新place。

Answer 1

您可以使用update执行此操作，假设每行id都是唯一的：

update players
    set place = p.new_place
    from (select p.*, row_number() over (order by score) as new_place
          from players p
         ) p
    where players.id = p.id;

Answer 2

UPDATE players
  SET place=ordered_place
 FROM (SELECT id, 'place' AS ordered_place
         FROM players
        ORDER BY score
      ) AS t1 
WHERE players.id=t1.id;