SQL查询-使用计数

我的数据库结构如下：

Table - lodges
LodgeID (PK)
Lodge
etc

Table - scores
ScoreID (PK)
Score
CategoryID
LodgeID (FK)

我正在尝试以以下形式返回结果：

LodgeID，Lodge，类别，该类别的分数，该类别的平均分数

例如，如果我有：

住宿

LodgeID, Lodge
1, Lodge One
2, Lodge Two

ScoreID, Score, CategoryID, LodgeID
1, 3, 101, 1
2, 5, 101, 1
3, 7, 101, 1
4, 10, 102, 2
5, 20, 102, 2
6, 30, 102, 2
7, 40, 102, 2

得分

LodgeID, Lodge
1, Lodge One
2, Lodge Two

ScoreID, Score, CategoryID, LodgeID
1, 3, 101, 1
2, 5, 101, 1
3, 7, 101, 1
4, 10, 102, 2
5, 20, 102, 2
6, 30, 102, 2
7, 40, 102, 2

我想返回：

1, Lodge One, 3, 5
2, Lodge Two, 4, 25

我一直在尝试这样的事情：

SELECT        COUNT(ScoreID) as scoreCount, AVG(Score) as AverageScore, Lodge 
FROM          scores_temp 
INNER JOIN    lodges_temp ON scores_temp.LodgeID = lodges_temp.LodgeID

选择lodges\u temp.LodgeID，Lodge，COUNT（ScoreID）作为scoreCount，AVG（Score）作为AverageScore，从lodges\u temp内部连接

scores\u temp

中选择lodges\u temp=scores\u temp.LodgeID=scores

没有任何成功。任何提示都将不胜感激。

试试这个

SELECT        COUNT(ScoreID) as scoreCount, AVG(Score) as AverageScore, Lodge 
FROM          scores_temp 
INNER JOIN    lodges_temp ON scores_temp.LodgeID = lodges_temp.LodgeID
GROUP BY Lodge

---

您缺少一个

分组依据

子句：

SELECT     COUNT(ScoreID) as scoreCount, AVG(Score) as AverageScore, Lodge 
FROM       scores
INNER JOIN lodges ON scores.LodgeID = lodges.LodgeID
GROUP BY   lodge

---

您应该查看

分组依据

。您是否在末尾添加了分组依据？谢谢！我总是忘记分组！