php - 从 PHP 更新表中的排名行

Question

此代码动态创建排名并相应地设置它们。现在的问题是如何更新表中的排名值而不重复？我最近发布了这个问题，但没有找到解决方案。我是将此代码应用于 PHP 代码，以便排名根据 TeamPoints 进行更新...

请帮帮我!谢谢...

SELECT TeamID,
   TeamName,
   TeamLeader,
   TeamEmail,
   TeamWins,
   TeamLoss,
   TeamPoints,
   TeamRank
   FROM
      (
         SELECT TeamID,
                TeamName,
                TeamLeader,
                TeamEmail,
                TeamWins,
                TeamLoss,
                TeamPoints,
                @Rank := @Rank + 1 AS TeamRank
                FROM team
                CROSS JOIN (SELECT @Rank:=0) Sub0
                ORDER BY TeamPoints DESC
      ) Sub1

Answer 1

您只是在执行SELECT 语句。为了UPDATE，您实际上必须在原始表上使用UPDATE语句，并使用该查询来提供 teamRank 的值:

UPDATE team t
INNER JOIN(
  SELECT TeamID,
  TeamPoints,
  @Rank := @Rank + 1 AS TeamRank
  FROM team
  CROSS JOIN (SELECT @Rank:=0) Sub0
  ORDER BY TeamPoints DESC
  ) a ON a.teamID = t.teamID
SET t.teamRank = a.teamRank