mysqlのMAXクエリが結合時に最新のレコードを返さない

Question

左の結合が最新のレコードを返さないことを除いて、正しいデータを返すクエリがあります（dateuploaded列による順序付け）。ありがとうございました。

select a.*,p.thumbnailphotopath as Picture from album_access ac 
inner join albums a on a.ID = ac.AlbumID 
left join (select albumid, thumbnailphotopath,max(DateUploaded) from photos where IsProcessed = 1 and IsPrivate = 0 GROUP BY albumID) p on a.ID = p.AlbumID #photos record not latest 
where ac.AccessUserID = ? and ac.Ispending = 0 and ac.FullControl = 1 and a.Private = 1 order by a.DateCreated desc limit ?,?; 

List of dates that return desc (its returning 2012-05-01 09:45:43 and thats not the latest) 
2012-05-01 09:46:17 
2012-05-01 09:46:06 
2012-05-01 09:45:43 --Returning this record 
2012-05-01 09:45:30 
2012-05-01 09:39:49 

Answer 1

あなたはMAX`が想定されていない

select 
     a.*, 
     pFinal.thumbnailphotopath as Picture 
    from 
     album_access ac 
     inner join albums a 
      on ac.AlbumID = a.ID 
      AND a.Private = 1 
     left join (select 
          p.albumid, 
          max(p.dateUploaded) as MaxDate 
         from 
          photos p 
         where 
           p.IsProcessed = 1 
          AND p.IsPrivate = 0 
         group by 
          p.AlbumID) pMax 
      on ac.AlbumID = pMax.AlbumID 
       left join photos pFinal 
        on pMax.AlbumID = pFinal.AlbumID 
       AND pMax.MaxDate = pFinal.DateUpladed 
    where 
      ac.AccessUserID = ? 
     and ac.Ispending = 0 
     and ac.FullControl = 1 
    order by 
     a.DateCreated desc 
    limit ?,?;