MySQLでのランク付けと重み付けに基づく選択

Question

Gold（3）、Silver（2）、Bronze（1）の数値を測定することによって得られたメダルの数に基づいて、次の表から

+-----------+-------------+--------+-----------------+----------------------------+-------------------------------+-----------------------------------------+---------------------------------+-------------------------+ 
| idRESULTS | STATUS  | MEDALS | EVENTS_idEVENTS | EVENTS_ATHLETES_idATHLETES | EVENTS_ATHLETES_TEAMS_idTEAMS | EVENTS_ATHLETES_TEAMS_COUNTRY_idCOUNTRY | EVENTS_VARIOUS_SPORTS_SPORTS_ID | awarded_medals_medal-id | 
+-----------+-------------+--------+-----------------+----------------------------+-------------------------------+-----------------------------------------+---------------------------------+-------------------------+ 
| results1 | DID-NOT-WIN | SILVER | TEN    | MS       | RUS-WTA      | RUS          | WOMENS_TENNIS     |      2 | 
| results1 | WON   | GOLD | TEN    | VW       | USA-WTA      | USA          | WOMENS_TENNIS     |      3 | 
| results2 | DID-NOT-WIN | BRONZE | ATH    | JG       | USA-TF-MEN     | USA          | TRACK-AND-FIELD     |      3 | 
| results2 | WON   | GOLD | ATH    | UB       | JAM-TF-MEN     | JAM          | TRACK-AND-FIELD     |      1 | 
| results3 | WON   | GOLD | TEN-DOUBLE  | SW       | USA-WTA      | USA          | WOMENS_TENNIS     |      3 | 
| results3 | WON   | GOLD | TEN-DOUBLE  | VW       | USA-WTA      | USA          | WOMENS_TENNIS     |      1 | 
+-----------+-------------+--------+-----------------+----------------------------+-------------------------------+-----------------------------------------+---------------------------------+-------------------------+ 

私はこのコードを以下に示しますが、これは期待される出力を生成しませんか？

select EVENTS_ATHLETES_TEAMS_COUNTRY_idCOUNTRY,MEDALS 
from results 
group by EVENTS_ATHLETES_TEAMS_COUNTRY_idCOUNTRY 

Answer 1

これを試してみてください！

select EVENTS_ATHLETES_TEAMS_COUNTRY_idCOUNTRY, rank() over (Order by Score desc) as Ranking 
from 
(
    select EVENTS_ATHLETES_TEAMS_COUNTRY_idCOUNTRY, sum(
     case when MEDALS='GOLD' then 3 --assigning gold a value of 3 
     when MEDALS='SILVER' then 2 --assigning silver a value of 2 
     when MEDALS='BRONZE' then 1 --assigning bronze a value of 1 
     end) as Score 
    group by 1 
) Scores 

あなたが最初のものでやっていた主要なものだけでスコアを割り当てることはないEVENTS_ATHLETES_TEAMS_COUNTRY_idCOUNTRYとメダルのすべてのユニークなコンボを、引っ張りました。個別にランク付けすることに興味がある場合は、それに応じて値を変更することができます。