SQL更新使用遊標

Question

我有表Stucture這樣

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通過Player5包含玩家ID的。 Contri_p1到Contri_p5列包含它們的點值（全部最初爲0）。現在我想更新一名球員的分數。比方說，我想更新gameID = 1中玩家id = 4的點。玩家id的位置並不是每次都是固定的。我需要搜索和更新。

我該怎麼做？

Answer 1

我不會試圖想出一些巧妙的（看起來有點複雜）方式試圖將你的更新塞入你當前的設計，但改變你的表的設計。現在

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可以簡單的

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

編輯
對於completenes，整個腳本，包括顯示的結果，按您的問題可能是這樣

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