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SELECT tblT.Tick, First(tblB.BDF) AS FirstOfBDF
FROM tblT INNER JOIN tblB ON tblT.Tick = tblB.Tick
GROUP BY tblT.Tick;
我的訪問表（tblB）按照Tick和BDF排序。它怎麼沒有檢索到正確的數據？First（）INNER JOIN
A
回答
2
除非您明確提及Order by，否則無法保證表格已經排序。
select top 1 tblT.Tick, First(tblB.BDF) AS FirstOfBDF
from FROM tblT INNER JOIN tblB ON tblT.Tick = tblB.Tick
GROUP BY tblT.Tick
Order by tblt.Tick ;
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爲什麼使用_first（）_ –
在SQL中，表*不是*排序的。您的數據庫產品可能會提供某些特定的保證，但對於一般語言，您的聲明不是真實的。請添加您使用的數據庫系統作爲標籤。 –
@Damien_The_Unbeliever：_FIRST（）函數僅在MS Access中受支持。 –