Question

我最近再次使用sql，上次使用它是在Microsoft Access 2000中，所以如果我落后于时代，请忍受。

我的不和谐服务器上有2种无意义的虚拟货币供玩家玩无意义的游戏。这两种货币的交易当前都存储在单独的表中。

我希望对每个玩家的所有交易进行汇总，以便为每个货币提供一个当前金额。我个人可以这样做：

SELECT
 tblPlayers.PlayerID AS PlayerID,
 tblPlayers.Name AS Name,
 SUM(tblGorillaTears.Amount) 
FROM 
 tblPlayers 
INNER JOIN 
 tblGorillaTears
ON 
 tblPlayers.PlayerID = tblGorillaTears.PlayerID 
GROUP BY 
 tblPlayers.PlayerID;

和

SELECT
 tblPlayers.PlayerID AS PlayerID,
 tblPlayers.Name AS Name,
 SUM(tblKebabs.Amount) 
FROM 
 tblPlayers 
INNER JOIN 
 tblKebabs 
ON 
 tblPlayers.PlayerID = tblKebabs.PlayerID 
GROUP BY 
 tblPlayers.PlayerID;

我需要的是一张在一行上输出用户名ID和每种货币的总数的表，但是当我这样做时：

SELECT
 tblPlayers.PlayerID AS PlayerID,
 tblPlayers.Name AS Name,
 SUM(tblGorillaTears.Amount) AS GT,
 0 as Kebabs
FROM 
 tblPlayers 
INNER JOIN 
 tblGorillaTears
ON 
 tblPlayers.PlayerID = tblGorillaTears.PlayerID 
GROUP BY 
 tblPlayers.PlayerID
UNION 
SELECT
 tblPlayers.PlayerID AS PlayerID,
 tblPlayers.Name AS Name,
 0 as GP,
 SUM(tblKebabs.Amount) 
FROM 
 tblPlayers 
INNER JOIN 
 tblKebabs 
ON 
 tblPlayers.PlayerID = tblKebabs.PlayerID 
GROUP BY 
 tblPlayers.PlayerID;

对于每种货币，每个玩家的结果都排在一行。我如何才能使两种货币都出现在同一行？

以前，在MSAccess中，我能够创建两个查询，然后对这两个查询进行查询，就好像它们是一个表一样，但是在这种情况下，我不知道该怎么做。谢谢<3

Answer 1

UNION将确保添加新行，您可以尝试以下查询。

SELECT TP.playerid                        AS PlayerID, 
       TP.NAME                            AS NAME, 
       (SELECT Sum(TG.amount) 
        FROM   tblgorillatears TG 
        WHERE  TG.playerid = TP.playerid) AS GT, 
       (SELECT Sum(TG.amount) 
        FROM   tblkebabs TG 
        WHERE  TG.playerid = TP.playerid) AS Kebabs 
FROM   tblplayers TP

sqlite结合了来自不同表的2个查询以组成一个

1 个答案: