SQL中使用COUNT

Question

我試圖做一個簡單的查詢到我的服務器，並希望結果集中變量存儲在變量@times。

DECLARE @times int 

SET @times = SELECT COUNT(DidWin)as "I Win" 
FROM thetable 
WHERE DidWin = 1 AND Playername='Me' 

智能感知說Wrong syntax near Select

Answer 1

你只需要括號圍繞你的選擇：

SET @times = (SELECT COUNT(DidWin) FROM ...) 

或者你也可以做這樣的：

SELECT @times = COUNT(DidWin) FROM ... 

Answer 2

可以直接選擇到變量，而不是使用集：

DECLARE @times int 

SELECT @times = COUNT(DidWin) 
FROM thetable 
WHERE DidWin = 1 AND Playername='Me' 

如果需要設置多個變量，你可以從相同的選擇（例如做有點做作）：

DECLARE @wins int, @losses int 

SELECT @wins = SUM(DidWin), @losses = SUM(DidLose) 
FROM thetable 
WHERE Playername='Me' 

如果你偏愛使用set，您可以使用括號：

DECLARE @wins int, @losses int 

SET (@wins, @losses) = (SELECT SUM(DidWin), SUM(DidLose) 
FROM thetable 
WHERE Playername='Me'); 

Answer 3

你想：

DECLARE @times int 

SELECT @times = COUNT(DidWin) 
FROM thetable 
WHERE DidWin = 1 AND Playername='Me' 

你也不需要 '爲' 條款。

Answer 4

您可以使用SELECT爲lambacck說 或加括號：

SET @times = (SELECT COUNT(DidWin)as "I Win" 
FROM thetable 
WHERE DidWin = 1 AND Playername='Me');