您好，有没有一种方法可以根据与 SELECT 语句其余部分不同的条件进行 SUM(total_points) 计算，所以我想要为
非常感谢您的帮助。
SELECT
members.member_id,
members.teamname,
SUM(total_points) as total_points,
total_points as last_race_points
FROM
members,
members_leagues,
member_results
WHERE
members.member_id = members_leagues.member_id
AND members_leagues.league_id = '$chosenleague'
AND member_results.track_id = '$chosentrack'
AND members_leagues.start_race = '$chosentrack'
AND member_results.member_id = members_leagues.member_id
GROUP BY
members.member_id
ORDER BY
member_results.total_points DESC,
last_race_points DESC,
members.teamname DESC
您还可以将求和放在 case 语句中，其中 case 评估其他条件，然后仅对条件为 true 的记录求和...
SELECT m.member_id, m.teamname,
Sum(Case When r.track_Id = '$chosentrack'
Then total_points Else 0 End) TotalChosenTrackPoints,
Sum(Case When r.track_Id < '$chosentrack'
Then total_points Else 0 End) TotalLessThanChosenTrackPoints,
total_points as last_race_points
FROM members m
Join members_leagues l
On l.member_id = m.member_id
Join member_results r
On r.member_id = m.member_id
Where l.league_id = '$chosenleague'
And l.start_race = '$chosentrack'
Group By m.member_id
Order By r.total_points Desc,
last_race_points Desc, m.TeamName Desc
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