访问SQL STDEV导致#error

Question

我试图通过查询计算访问中字段的标准差。这是我正在使用的公式：

SELECT STDev(Answers.[Answer (#)]) AS 'Standard Deviation'
FROM Answers;

运行查询时，我得到#error作为答案。查询看起来很简单，我不认为我的语法错误。可能是什么问题？

Answer 1

应该是：

SELECT STDev(Answers.[Answer (#)]) AS [Standard Deviation]
FROM Answers;

排除/忽略 Null 值：

SELECT STDev(Nz(Answers.[Answer (#)], 0)) AS [Standard Deviation]
FROM Answers;

或：

SELECT STDev(Answers.[Answer (#)]) AS [Standard Deviation]
FROM Answers
WHERE Answers.[Answer (#)] Is Not Null;