"如何在我的 SQL 查询中使用 FIND_IN_SET 和 sum 列"

Question

Can anyone help me? I have a table result like this:

id_user	score	type
001	30	play
001	40	play
001	30	redeem
002	20	play
002	30	redeem

I want to sum column score group by id_user base on type 'play' and after that I want show ranking using find_in_set. Like this is the result of the table that I want to display:

id_user	total	rank
001	70	1
002	20	2

Previously I used the rank() function in mysql Ver 10.4, but it does not work in MySQL ver 15.1. This is my previous query:

SELECT id_user,  SUM(score) AS total,
       RANK() OVER (ORDER BY total DESC) AS rank
FROM result
WHERE type='play'
GROUP BY id_user

Answer 1

I have made some changes in your query. It's working now. Instead of column alias total SUM(score) needs to be used in order by clause of Rank() function's over(). And since Rank is a reserve word I used rnk instead.

DB-Fiddle:

 create table result (id_user varchar(5), score int, type varchar(20));
 insert into result values('001',30 ,'play');
 insert into result values('001',40 ,'play');
 insert into result values('001',30 ,'redeem');
 insert into result values('002',20 ,'play');
 insert into result values('002',30 ',redeem');

Query:

 select id_user,  SUM(score) AS total, RANK() OVER (ORDER BY SUM(score) DESC) AS rnk FROM result where type='play' GROUP BY id_user

Output:

id_user	total	rnk
001	70	1
002	20	2

db<>fiddle here

If your MySQL version doesn't support rank() you can use subquery to achieve same result:

Query: select id_user, SUM(score) AS total, coalesce((select count(distinct id_user) from result r2 where type='play' group by id_user having sum(r2.score)>sum(r.score) ),0)+1 AS rnk FROM result r where type='play' GROUP BY id_user

Output:

id_user	total	rnk
001	70	1
002	20	2

db<>fiddle here