Question

我正在尝试查找所有列出的字段的总和，但鉴于它们是子查询...我需要使用别名。如果我使用列出的别名，我会得到列/字段未知错误...如果我使用group by尝试求和（点数），我会无效地使用group子句错误。

SELECT DISTINCT pr.competitorID AS compID, pr.age, CONCAT(pr.firstname, ' ', pr.lastname)AS name
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=1 AND participation_reports.competitorID=compID LIMIT 1) AS '100m'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=25 AND participation_reports.competitorID=compID LIMIT 1) AS '200m'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=37 AND participation_reports.competitorID=compID LIMIT 1) AS '400m'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=49 AND participation_reports.competitorID=compID LIMIT 1) AS '800m'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=61 AND participation_reports.competitorID=compID LIMIT 1) AS '1500m'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=67 AND participation_reports.competitorID=compID LIMIT 1) AS '3000m'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=69 AND participation_reports.competitorID=compID LIMIT 1) AS 'Javelin'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=81 AND participation_reports.competitorID=compID LIMIT 1) AS 'Shot Put'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=93 AND participation_reports.competitorID=compID LIMIT 1) AS 'Discus'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=105 AND participation_reports.competitorID=compID LIMIT 1) AS 'High Jump'
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=117 AND participation_reports.competitorID=compID LIMIT 1) AS 'Long Jump'
, (SELECT SUM(participation_reports.points) FROM participation_reports WHERE participation_reports.competitorID=compID) AS total
FROM participation_reports AS pr
JOIN event_data on event_data.eventID=pr.heatEventID
 WHERE event_data.minAge <= pr.age AND event_data.maxAge >= pr.age AND sex = 'F'
 AND total > 0
 LIMIT 30

感谢任何想法。

Answer 1

试一试：

SELECT 
    pr.competitorID AS compID
    , pr.age 
    , CONCAT(pr.firstname, ' ', pr.lastname) AS name
    , SUM(CASE 
        WHEN pr.heatEventID=1 
        THEN pr.points 
        ELSE 0 END) AS "100m"
    , SUM(CASE 
        WHEN pr.heatEventID=25 
        THEN pr.points 
        ELSE 0 END) AS "200m"
    ...
    , SUM(CASE 
        WHEN pr.heatEventID IN (1,25,...)
        THEN pr.points
        ELSE 0 END) AS total
FROM 
    participation_reports pr
    JOIN event_data 
    ON event_data.eventID = pr.heatEventID
WHERE 
    ...
GROUP BY 
    pr.competitorID
    , pr.age
    , CONCAT(pr.firstname, ' ', pr.lastname)

Answer 2

将该查询包装为派生表，然后选择总和。

Answer 3

我不太清楚你需要什么，但如果你想要所有那些别名列的总和，你的麻烦可能不是它们不是合法的列名吗？怎么样......

SELECT DISTINCT pr.competitorID AS compID, pr.age, CONCAT(pr.firstname, ' ', pr.lastname)AS name
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=1 AND participation_reports.competitorID=compID LIMIT 1) AS c_100m
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=25 AND participation_reports.competitorID=compID LIMIT 1) AS c_200m
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=37 AND participation_reports.competitorID=compID LIMIT 1) AS c_400m
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=49 AND participation_reports.competitorID=compID LIMIT 1) AS c_800m
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=61 AND participation_reports.competitorID=compID LIMIT 1) AS c_1500m
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=67 AND participation_reports.competitorID=compID LIMIT 1) AS c_3000m
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=69 AND participation_reports.competitorID=compID LIMIT 1) AS Javelin
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=81 AND participation_reports.competitorID=compID LIMIT 1) AS Shot_Put
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=93 AND participation_reports.competitorID=compID LIMIT 1) AS Discus
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=105 AND participation_reports.competitorID=compID LIMIT 1) AS High_Jump
, (SELECT  participation_reports.points FROM participation_reports WHERE participation_reports.heatEventID=117 AND participation_reports.competitorID=compID LIMIT 1) AS Long_Jump,
c_100m + c_200m + c_400m + c_800m + c_1500m + c_3000m + Javelin + Shot_Put + High_Jump + Long_Jump
, (SELECT SUM(participation_reports.points) FROM participation_reports WHERE participation_reports.competitorID=compID) AS total
FROM participation_reports AS pr
JOIN event_data on event_data.eventID=pr.heatEventID
 WHERE event_data.minAge <= pr.age AND event_data.maxAge >= pr.age AND sex = 'F'
 AND total > 0
 LIMIT 30

还是我误解了这个问题？

SQL - 别名的字段的SUM

3 个答案: