How to use user variable as counter with inner join queries that contains GROUP BY statement?

问题

I have 2 tables odds and matches :

matches : has match_id and match_date

odds : has id, timestamp, result, odd_value, user_id, match_id

I had a query that get the following information from those tables for each user:

winnings : the winning bets for each user. (when odds.result = 1)
loses : the lost bets for each user.(when odds.result != 1)
points : the points of each user.(the sum of the odds.odd_value) for each user.
bonus : for each continuous 5 winnings i want to add extra bonus to this variable. (for each user)

How to calculate bonus? I tried to use this query and I faced a problem : (you can check it here SQL Fiddle)

the calculated bonus are not right for all the users :

first user:(winnings:13, bonus=2).

second user:(winnings:8, bonus=2)bonus here should be 1.

third user:(winnings:14, bonus=3)bonus here should be 2.

why does the query not calculate the bonus correctly?

        select  d.user_id,
        sum(case when d.result = 1 then 1 else 0 end) as winnings, 
        sum(case when d.result = 2 then 1 else 0 end) as loses,
        sum(case when d.result = 1 then d.odd_value else 0 end) as points,
        f.bonus
FROM odds d
    INNER JOIN
    (
      SELECT  
            user_id,SUM(CASE WHEN F1=5 THEN 1 ELSE 0 END) AS bonus
        FROM
        (
          SELECT 
            user_id,
            CASE WHEN result=1 and @counter<5 THEN @counter:=@counter+1 WHEN result=1 and @counter=5 THEN @counter:=1 ELSE @counter:=0 END AS F1
          FROM odds o
          cross join (SELECT @counter:=0) AS t
          INNER JOIN matches mc on mc.match_id = o.match_id
           WHERE MONTH(STR_TO_DATE(mc.match_date, '%Y-%m-%d')) = 2 AND 
                  YEAR(STR_TO_DATE(mc.match_date, '%Y-%m-%d')) =  2015 AND
                  (YEAR(o.timestamp)=2015 AND MONTH(o.timestamp) = 02)            
        ) Temp
        group by user_id
        )as f on f.user_id = d.user_id
      group by d.user_id

回答1:

I am not sure how your result related to matches table,

you can add back WHERE / INNER JOIN clause if you need.

Here is link to fiddle

and the last iteration according to your comments:

And here is a query:

SET @user:=0;

select  d.user_id,
        sum(case when d.result = 1 then 1 else 0 end) as winnings, 
        sum(case when d.result = 2 then 1 else 0 end) as loses,
        sum(case when d.result = 1 then d.odd_value else 0 end) as points,
        f.bonus
FROM odds d
    INNER JOIN
    (
      SELECT  
            user_id,SUM(bonus) AS bonus
        FROM
        (
          SELECT 
            user_id,
            CASE WHEN result=1 and @counter<5 AND @user=user_id THEN @counter:=@counter+1 

                 WHEN result=1 and @counter=5 AND @user=user_id THEN @counter:=1 

                 WHEN result=1 and @user<>user_id THEN @counter:=1 
                 ELSE 
                 @counter:=0 
            END AS F1,
            @user:=user_id,
            CASE WHEN @counter=5 THEN 1 ELSE 0 END AS bonus 
          FROM odds o
          ORDER BY user_id , match_id         
        ) Temp
        group by user_id
        )as f on f.user_id = d.user_id
      group by d.user_id

来源：https://stackoverflow.com/questions/28674647/how-to-use-user-variable-as-counter-with-inner-join-queries-that-contains-group

标签

mysql

aggregate-functions