SQL Server和嵌套的SELECT：...'）'附近的語法不正確？

執行我的代碼時出現此錯誤。這是什麼意思？我正在使用SQL Server Management Server Express。SQL Server和嵌套的SELECT：...'）'附近的語法不正確？

消息102，級別15，狀態1，行7

附近有語法錯誤 '）'。

declare @start datetime 
declare @end datetime 
set @start = '2012/01/02' 
set @end = '2012/01/06' 


SELECT 
SUM(VCount) as [Total], 
vdate, 
(select COUNT(VIP) From (SELECT DISTINCT(VIP) FROM dbo.Visiter)) as [IP3] 
FROM dbo.Visiter 
where VDate between @start and @end 
GROUP BY VDate

來源

2012-01-06 user1133937

在SQL Server中，當你在FROM子句中使用派生表（子查詢），你必須給派生表的別名：

SELECT 
SUM(VCount) as [Total], 
vdate, 
-- add an alias in the next line 
(select COUNT(VIP) From (SELECT DISTINCT(VIP) FROM dbo.Visiter) AS a) as [IP3] 
FROM dbo.Visiter 
where VDate between @start and @end 
GROUP BY VDate

參考：FROM clause

來源

2012-01-06 08:56:22

我覺得這

(select COUNT(VIP) From (SELECT DISTINCT(VIP) FROM dbo.Visiter)) as [IP3]

是更好地轉化爲

(select COUNT(DISTINCT VIP) FROM dbo.Visiter) as [IP3]

據我所知，MySQL的，至少說Every derived table must have its own alias這樣，你的子查詢早該樣子

(select COUNT(v) From (SELECT DISTINCT(VIP) AS v FROM dbo.Visiter) AS tmp1) as [IP3]

但短 - 好=）

來源

2012-01-06 08:51:55 shybovycha

ID做的和得到這個：消息156，15級，狀態1，11號線語法錯誤關鍵字接近 'SELECT'。 Msg 102，Level 15，State 1，Line 11 '）'附近語法不正確。 – user1133937 2012-01-06 08:55:07

是的，抱歉，修正。已經測試=） – shybovycha 2012-01-06 08:56:32

我想獲得唯一訪客的數量，但這讓我總結所有獨特的訪客。請幫助我（對不起我弱的英語; D） – user1133937 2012-01-06 09:21:37

SQL Server和嵌套的SELECT：...'）'附近的語法不正確？

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