[英]SQL Server Averages/Sums/Groups/Counts Query Issue
I have the following table: 我有下表:
╔══════════╦════════╦═══════╦═══════╗ ║ PlayerID ║ GameID ║ Stat1 ║ Stat2 ║ ╠══════════╬════════╬═══════╬═══════╣ ║ 1 ║ A ║ 2 ║ 1 ║ ║ 1 ║ B ║ 4 ║ 2 ║ ║ 1 ║ C ║ 6 ║ 5 ║ ║ 2 ║ A ║ 2 ║ 4 ║ ║ 2 ║ B ║ 2 ║ 6 ║ ║ 2 ║ C ║ 2 ║ 8 ║ ║ 2 ║ D ║ 4 ║ 2 ║ ║ 2 ║ E ║ 6 ║ 1 ║ ║ 3 ║ A ║ 5 ║ 9 ║ ║ 3 ║ G ║ 6 ║ 4 ║ ║ 3 ║ H ║ 4 ║ 2 ║ ║ 3 ║ N ║ 8 ║ 6 ║ ╚══════════╩════════╩═══════╩═══════╝
What I am trying to achieve is the following: 我想要实现的目标如下:
╔══════════╦═══════════╦═══════════════════╦═══════════════════╗ ║ PlayerID ║ GameCount ║ Stat 1 Avg / Game ║ Stat 2 Avg / Game ║ ╠══════════╬═══════════╬═══════════════════╬═══════════════════╣ ║ 1 ║ 3 ║ 4 ║ 2.66 ║ ║ 2 ║ 5 ║ 3.2 ║ 4.2 ║ ║ 3 ║ 4 ║ 5.75 ║ 5.25 ║ ╚══════════╩═══════════╩═══════════════════╩═══════════════════╝
The game count should be the total number of games played per player and the stats should be the average per game. 游戏数应该是每个玩家玩的游戏总数,统计数据应该是每场游戏的平均数。 Basically the calculation for PlayerID 1 is the following:
基本上,PlayerID 1的计算如下:
"Stat1 Avg / Game" = (2 + 4 + 6) / 3 "Stat2 Avg / Game" = (1 + 2 + 5) / 3 “Stat1平均/游戏”=(2 + 4 + 6)/ 3“Stat2平均/游戏”=(1 + 2 + 5)/ 3
I have tried numerous variations of the same query with a combination of SUMS and COUNTS but the GameCount never comes out correct. 我已经尝试了SUMS和COUNTS组合的同一查询的多种变体,但GameCount永远不会出错。 An example of what I have tried is below
我尝试过的一个例子如下
SELECT PlayerID,
COUNT(GameID) AS GameCount,
SUM(Stat1) / COUNT(GameID) "Stat 1 Avg / Game",
SUM(Stat2) / COUNT(GameID) "Stat 2 Avg / Game"
FROM PublishedStats A
GROUP BY PlayerID
SELECT PlayerID,
COUNT(GameID) OVER (PARTITION BY PlayerID) AS GameCount,
SUM(Stat1) / COUNT(GameID) OVER (PARTITION BY PlayerID) "Stat 1 Avg / Game",
SUM(Stat2) / COUNT(GameID) OVER (PARTITION BY PlayerID) "Stat 2 Avg / Game",
FROM Stats
GROUP BY PlayerID, GameID
So just add the DISTINCT keyword. 所以只需添加DISTINCT关键字即可。
SELECT PlayerID,
COUNT(DISTINCT GameID) AS GameCount,
AVG(Stat1) "Stat 1 Avg / Game",
AVG(Stat2) "Stat 2 Avg / Game"
FROM PublishedStats A
GROUP BY PlayerID
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