SQL更新使用游标

Question

我有表Stucture这样

GameID  Player1 Player2 Player3  Player4  Player5  conrti_P1 Contri_P2 Conrti_P3 Contri_P4 Contri_P5 

1    1  2   3   4   5    0   0   0   0   0 

2    2  1   5   3   4    0   0  0   0  0  

列PLA​​YER1通过Player5包含玩家ID的。 Contri_p1到Contri_p5列包含它们的点值（全部最初为0）。现在我想更新一名球员的分数。比方说，我想更新gameID = 1中玩家id = 4的点。玩家id的位置并不是每次都是固定的。我需要搜索和更新。

我该怎么做？

Answer 1

我不会试图想出一些巧妙的（看起来有点复杂）方式试图将你的更新塞入你当前的设计，但改变你的表的设计。现在

BEGIN TRAN 

CREATE TABLE Games (GameID INT PRIMARY KEY) 
CREATE TABLE Players (PlayerID INT PRIMARY KEY) 
CREATE TABLE PlayersGames (GameID INT, PlayerID INT, Position INT, conrti INT) 

INSERT INTO Games VALUES (1), (2) 
INSERT INTO Players VALUES (1), (2), (3), (4), (5) 
INSERT INTO PlayersGames VALUES (1,1,1,0), (1,2,2,0), (1,3,3,0), (1,4,4,0), (1,5,5,0), (2,2,1,0), (2,1,2,0), (2,5,3,0), (2,3,4,0), (2,4,5,0) 

ROLLBACK TRAN 

你UPDATE可以简单的

UPDATE PlayersGames SET contri = @YourValue WHERE PlayerID = 4 AND GameID = 1 

编辑
对于completenes，整个脚本，包括显示的结果，按您的问题可能是这样

BEGIN TRAN 

CREATE TABLE dbo.Games (GameID INT PRIMARY KEY) 
CREATE TABLE dbo.Players (PlayerID INT PRIMARY KEY) 
CREATE TABLE dbo.PlayersGames (GameID INT, PlayerID INT, Position INT, contri INT) 
ALTER TABLE dbo.PlayersGames ADD CONSTRAINT FK_PLAYERSGAMES_PLAYERS FOREIGN KEY (PlayerID) REFERENCES dbo.Players(PlayerID) 
ALTER TABLE dbo.PlayersGames ADD CONSTRAINT FK_PLAYERSGAMES_GAMES FOREIGN KEY (GameID) REFERENCES dbo.Games(GameID) 

INSERT INTO Games VALUES (1), (2) 
INSERT INTO Players VALUES (1), (2), (3), (4), (5) 
INSERT INTO PlayersGames VALUES (1,1,1,0), (1,2,2,3), (1,3,3,0), (1,4,4,0), (1,5,5,0), (2,2,1,0), (2,1,2,0), (2,5,3,0), (2,3,4,0), (2,4,5,0) 

SELECT GameID 
     , Player1 = MIN(CASE WHEN Position = 1 THEN PlayerID ELSE NULL END) 
     , Player2 = MIN(CASE WHEN Position = 2 THEN PlayerID ELSE NULL END) 
     , Player3 = MIN(CASE WHEN Position = 3 THEN PlayerID ELSE NULL END) 
     , Player4 = MIN(CASE WHEN Position = 4 THEN PlayerID ELSE NULL END) 
     , Player5 = MIN(CASE WHEN Position = 5 THEN PlayerID ELSE NULL END) 
     , contri_P1 = MIN(CASE WHEN Position = 1 THEN contri ELSE NULL END) 
     , contri_P2 = MIN(CASE WHEN Position = 2 THEN contri ELSE NULL END) 
     , contri_P3 = MIN(CASE WHEN Position = 3 THEN contri ELSE NULL END) 
     , contri_P4 = MIN(CASE WHEN Position = 4 THEN contri ELSE NULL END) 
     , contri_P5 = MIN(CASE WHEN Position = 5 THEN contri ELSE NULL END) 
FROM PlayersGames 
GROUP BY 
     GameID 

ROLLBACK TRAN