MySQL 从 DENSE_RANK() 结果更新相同的表字段

Question

i am trying to update field rank using DENSE_RANK() from same table,while trying to execute below query getting "Operand should contain 1 column(s)",kindly help in solving this issue

UPDATE scoretable SET rank= (SELECT *,DENSE_RANK() OVER (PARTITION BY game_id ORDER BY points DESC , diff ASC) FROM scoretable WHERE STATUS ='Active')

Table details

DENSE_RANK() query results

SELECT *,DENSE_RANK() OVER (PARTITION BY game_id ORDER BY points DESC , diff ASC) FROM scoretable WHERE STATUS ='Active'

Answer 1

As commentedby P.Salmon: MySQL does not allow the updated table to appear in a subquery. Instead, you can dense_rank() in a subquery, and then join it with the table, like so:

update scoretable s
inner join (
    select id, dense_rank() over(partition by game_id order by points desc, diff) rn
    from scoretable
    where status = 'Active'
) r on r.id = s.id
set s.rank = r.rn

Note: this assumes that id is a unique key in the table.