Question

您好我试图创建一个查询只显示具有相同3个字母的邮政编码，但是，它根本不返回任何内容。这是我的代码：

SELECT Custtbl.Name, Custtbl.PostCode
FROM Custtbl
Where (((Custtbl.PostCode)=Left([PostCode],3)))

任何帮助将不胜感激！

Answer 1

这是：

SELECT DISTINCT
    Custtbl.Name, 
    Custtbl.PostCode
FROM 
    Custtbl,
    Custtbl As T
WHERE 
    Custtbl.Name <> T.Name
    AND
    Left(Custtbl.PostCode, 3) = Left(T.[PostCode], 3)

Answer 2

您缺少Custtbl.PostCode上的Left功能。您的查询应该是

SELECT Custtbl.Name, Custtbl.PostCode
FROM Custtbl
Where ((LEFT(Custtbl.PostCode,3)=Left([PostCode],3)))

Answer 3

我认为你正在寻找LIKE条件。 TutorialPoint

SELECT Custtbl.Name, Custtbl.PostCode
FROM Custtbl
Where (Custtbl.PostCode LIKE Left([PostCode],3) + '%')

这将返回[PostCode]中前3个字符与Custtbl.PostCode中前3个字符匹配的任何行

MS访问SQL左功能不返回任何内容

3 个答案: