查詢表達式中的語法錯誤（逗號）。 MS Access 2013

Question

我在Access 2013中建立一個SQL查詢。這是我的查詢：

SELECT  
COUNT(Age) FROM Members AS [Under 12] WHERE Age <= 12,
COUNT(Age) FROM Members AS [13-18] WHERE Age BETWEEN 13 AND 18

但我不斷收到此錯誤：

查詢表達式'Age <= 12，來自SukkotMembers AS [13-18]年齡在13和18之間的語法錯誤（逗號）`

問題出在第二行末尾的逗號，但是我不明白為什么。 當我只運行一行時，它工作正常。 我對SQL真的很陌生，請注意。

我也剛剛意識到AS [Under 12]和AS [13-18]無法正常工作，我也不知道為什么

Answer 1

第一：您使用的語法不是有效的SQL，因為您有多個不允許的FROM子句； 這同樣適用於where子句，該子句對整個集合進行操作。

您不能僅將SQL的零碎片段和補丁打成一片，以得到有效的查詢-必須遵守一個相當嚴格且定義明確的語法。

您想要的是使用返回標量值的子查詢或使用條件計數：

SELECT  
  COUNT(IIF(Age<=12,age,null)) AS [Under 12] 
 ,COUNT(IIF(Age BETWEEN 13 AND 18,age,null)) AS [13-18]  
FROM Members

同樣， FROM Members AS [13-18]為表而不是列分配別名。

使用子查詢（我想這可能是您的意圖）：

SELECT DISTINCT
    (SELECT COUNT(*) FROM MEMBERS WHERE AGE<=12) AS  [UNDER 12] ,
    (SELECT COUNT(*) FROM MEMBERS WHERE AGE BETWEEN 13 AND 18) AS  [13-18]
FROM MEMBERS

Answer 2

您還可以總結：

SELECT  
    Sum(Abs(Age <= 12)) AS [Under 12],
    Sum(Abs(Age BETWEEN 13 AND 18)) AS [13-18]  
FROM 
    Members