Question

我在Access 2013中构建了一个SQL查询。这是我的查询：

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

但我一直收到这个错误：

查询表达式中的语法错误（逗号）＆＃39;年龄＆lt; = 12， COUNT（年龄）来自SukkotMembers AS [13-18]年龄在13和18之间`

问题在于第二行末尾的逗号，但我不明白为什么。当我只运行一行时它工作正常。我是SQL新手，所以你知道。

此外，我刚刚意识到AS [Under 12]和AS [13-18]无效，我也不知道为什么

Answer 1

首先：您使用的语法不是有效的SQL，因为您有多个FROM子句是不允许的;这同样适用于where子句，顺便说一下，它对整个集合起作用。

你不能只是将SQL和补丁一起取出来获得一个有效的查询 - 你必须坚持一个相当严格和明确定义的语法。

您想要的是使用返回标量值的子查询或使用条件计数：

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

此外，FROM Members AS [13-18]为表分配别名，而不是列。

使用子查询（我猜可能是你的意图）：

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

你也可以求和：

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

查询表达式中的语法错误（逗号）。 MS Access 2013

2 个答案: