[英]How to find the count of distinct records in a MS Access database using C#?
[英]How to Select Distinct records then count them in C# Access database?
所以 dbmitch 评论给了我先机,我只是稍微改变了一下。 这是解决方案:
"Select Column2,Count(T1.Column1) AS Column3 from (Select Column2,Column1 from TableA Group by Column1,Column2) AS T1 Group by T1.Column2"
尝试这个:
SELECT column2, Count(*) AS C FROM (SELECT DISTINCT column1 FROM TableA GROUP BY column2) AS D;
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