插入不存在的SQL访问权限 [英] Insert INTO NOT EXISTS SQL access

问题描述

我正在尝试使用sql将另一个表中的记录插入Access中的表中.我已经粘贴了下面的声明.我想插入ImportMetricsIDs01262015中存在的记录，但不应该插入ShouldImportMetricsIDs中的记录.它运行完美，没有任何错误，但是即使我实际添加新记录也不会插入任何内容.

I am trying to insert records from another table into a table in Access using sql. I have pasted the statement below. I want to insert the records that exist in ImportMetricsIDs01262015 but not in ShouldImportMetricsIDs. It runs perfectly without any errors but it won't insert anything even when I physically add a new record.

INSERT INTO ShouldImportMetricsIDsTable ( [Formulary ID], [Market Segment] )
SELECT ImportMetricsIDs01262015.[Formulary ID], ImportMetricsIDs01262015.[Market Segment]
FROM ImportMetricsIDs01262015
WHERE NOT EXISTS (SELECT *
FROM ShouldImportMetricsIDsTable);

推荐答案

您需要一个关联子句.子查询仅检查表是否为空.像这样:

You need a correlation clause. The subquery just checks whether or not the table is empty. Something like:

INSERT INTO ShouldImportMetricsIDsTable( [Formulary ID], [Market Segment] )
    SELECT im.[Formulary ID], im.[Market Segment]
    FROM ImportMetricsIDs01262015 as im
    WHERE NOT EXISTS (SELECT 1
                      FROM ShouldImportMetricsIDsTable as sim
                      WHERE im.[Formulary ID] = sim.[Formulary ID] AND
                            im.[Market Segment] = sim.[Market Segment]
                     );

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