Question

我的数据库中有两个表。一个是时间表，另一个是联盟球队表。 schedule表没有团队的名称，它只有他们的ID，但是team表有。

我用这段代码来加入表格

float volume_cm3 = 0, emptySpace_cm3 = 0;
int[] voxels = new int[2];

VoxelizationTest script= new VoxelizationTest();
voxels = script.Voxelize (GameObject.Find (pair.Value.name), 0.015f);
volume_cm3 = voxels[0] * Mathf.Pow(1.5f, 3);
emptySpace_cm3 = voxels[1] * Mathf.Pow(1.5f, 3);
Debug.Log ("Voxels object: " + voxels[0] + " VolumeCm3: 
                    " + volume_cm3 + " emptySpaceCm3: " + emptySpace_cm3);
float shapeRelation =  emptySpace_cm3 / (emptySpace_cm3 
                    + volume_cm3);
if(shapeRelation > mayor)
mayor = shapeRelation;
objectsShapeRelation.Add (pair.Value, shapeRelation);

正如您在本页http://2kolf.com/our-data/schedules-test.php所见，客队（左侧）是正确的，但主队的名称与客队相同。

我已尝试将代码更改为此 -

SELECT statsSchedules.*
     , leagueTeams.logoId
     , leagueTeams.cityName
     , leagueTeams.displayName 
FROM statsSchedules 
JOIN leagueTeams 
WHERE statsSchedules.homeTeamId 
  AND statsSchedules.awayTeamId=leagueTeams.teamId 
ORDER BY statsSchedules.weekIndex ASC

但这没有任何回报。

Answer 1

对于您拥有的每个唯一主键（PK）/外键（FK）关系;需要加入。

由于statsSchedules有两个FK到联盟队，你需要两个联盟队伍加入。

由于列名相同，我不建议别名;但桌子也加入了。

SELECT statsSchedules.*
     , homeTeam.logoId homeLogoId 
     , homeTeam.cityName homeCityName
     , homeTeam.displayName homeDisplayName
     , awayTeam.logoId awayLogoID
     , awayTeam.cityName awayCityName
     , awayTeam.displayName awayDisplayName
FROM statsSchedules 
INNER JOIN leagueTeams as homeTeam
   ON  statsSchedules.homeTeamId = homeTeam.TeamID
INNER JOIN leagueTeams as awayTeam 
   ON statsSchedules.awayTeamId = awayTeam.teamId 
ORDER BY statsSchedules.weekIndex ASC

Answer 2

如果你有两杯茶，你需要statsSchedules和leagueTeams之间的两个内部联接

  SELECT 
        statsSchedules.*
      , a.logoId
      , a.cityName
      , a.displayName 
      , b.logoId
      , b.cityName
      , b.displayName     
  FROM statsSchedules 
  INNER JOIN leagueTeams a  ON  statsSchedules.homeTeamId = a.teamId
  INNER JOIN leagueTeams b  ON  statsSchedules.homeTeamId = b.teamId
  ORDER BY statsSchedules.weekIndex ASC

从数据库连接表时显示的重复名称

2 个答案: