SQL中使用COUNT

Question

我试图做一个简单的查询到我的服务器，并希望结果集中变量存储在变量@times。

DECLARE @times int 

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

智能感知说Wrong syntax near Select

Answer 1

你只需要括号围绕你的选择：

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

或者你也可以做这样的：

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

Answer 2

可以直接选择到变量，而不是使用集：

DECLARE @times int 

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

如果需要设置多个变量，你可以从相同的选择（例如做有点做作）：

DECLARE @wins int, @losses int 

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

如果你偏爱使用set，您可以使用括号：

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 '为' 条款。

Answer 4

您可以使用SELECT为lambacck说 或加括号：

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