MS Access 查询 WHERE NOT EXISTS

Posted 2023-03-29

【中文标题】MS Access 查询 WHERE NOT EXISTS

【英文标题】：MS Access query WHERE NOT EXISTS

【发布时间】：2016-04-27 15:39:54

【问题描述】：

我一直在四处寻找，但无法解决这个问题。

我有两个来自两个查询的表

SELECT [Account Combination].[Account Number] & [Account Combination].[Cost Center] & [Account Combination].Amount as Val1 FROM [Account Combination];

与

SELECT [Account Combination].[Account Number] & [Account Combination].[Cost Center] & [Account Combination].Amount AS Val1 FROM [Account Information] INNER JOIN ([Cost Center] INNER JOIN [Account Combination] ON [Cost Center].[Cost Center Number] = [Account Combination].[Cost Center]) ON [Account Information].[Account Number] = [Account Combination].[Account Number];

Table1 有 1800 行，Table2 有 1600 行。我想看看在 Table1 中找到哪些在 Table2 中没有找到，即 200。

我已经尝试过 Table1 NOT EXISTS Tabel2，但由于一直出现语法错误，因此无法使其正常工作。

感谢您的宝贵时间， 西蒙。

【问题讨论】：

正确标记您的问题以快速获得正确答案

【参考方案1】：

您可以使用LEFT OUTER JOIN 和WHERE 条件（如下所示）来完成此操作

select t1.*
from (SELECT [Account Combination].[Account Number] & [Account Combination].[Cost Center] & [Account Combination].Amount as Val1 
FROM [Account Combination]) t1
left join (
SELECT [Account Combination].[Account Number] & [Account Combination].[Cost Center] & [Account Combination].Amount AS Val1 
FROM [Account Information] INNER JOIN ([Cost Center] INNER JOIN [Account Combination] 
ON [Cost Center].[Cost Center Number] = [Account Combination].[Cost Center]) 
ON [Account Information].[Account Number] = [Account Combination].[Account Number]) t2 
on t1.Val1 = t2.Val1 
where t2.Val1 is null;

【参考方案2】：

看看：This excellent answer

它回答了如何使用 NOT EXISTS 的问题。 顺便说一下，IS NULL 子句更快。