基於不匹配Valies的更新字段

Question

我想檢查一個表中的值與另一個表中的值，然後在第一個表中的字段不匹配時更新第一個表中的字段，但我不能讓代碼工作。

我到目前爲止所嘗試過的;

DoCmd.RunSQL "UPDATE Issues SET Message='There is an issue at or before the sex code Field' WHERE Issues.[Sex Code] = Ref.[Sex Code] AND Ref.[Sex Code] Is Null));" 

DoCmd.RunSQL "UPDATE Issues SET Message = 'There is an issue at or before the Sex Code field' LEFT JOIN Ref ON Issues.[Sex Code] = Ref.[Sex Code] WHERE ((Ref.[Sex Code]) Is Null);" 

DoCmd.RunSQL "SELECT Issues.[Sex Code] FROM Issues LEFT JOIN Ref ON Issues.[Sex Code] = Ref.[Sex Code] WHERE Ref.[Sex Code] Is Null UPDATE Issues SET Message='There is an issue at or before the Sex Code Field'" 

Answer 1

使用您的上述思想，你需要的是類似於下面的東西不過你確定你只需要加入對性別代碼，並沒有其他領域（如姓名，編號等）？

UPDATE Issues LEFT JOIN Ref ON Issues.[Sex Code] = Ref.[Sex Code] SET Issues.Message = 'There is an issue at or before the Sex Code field' 
WHERE (((Ref.[Sex Code]) Is Null)); 

以允許多個錯誤，你可以追加到「信息」領域，如以下（防止任何先前消息）：

UPDATE Issues LEFT JOIN Ref ON Issues.[Sex Code] = Ref.[Sex Code] 
SET Issues.Message = [Issues]![Message] & 'The Sex Code field is Null' & '; ' 
WHERE (((Ref.[Sex Code]) Is Null));