使用 sql server 的笛卡尔积

Question

我确实对使用 SQL SERVER 2012 的笛卡尔积有疑问。

这是我的示例查询：

SELECT A1.*
   ,RIGHT('00000' + A1.SampleID,5) AS [RealSampleID]

FROM
(
SELECT 
    ARS1.SampleID
   ,ARS1.SampleNo
FROM TblSamples AS ARS1
GROUP BY 
     ARS1.SampleNo
    ,ARS1.SampleID
) AS [A1]
INNER JOIN 
(
SELECT 
    ARS2.SampleID
   ,ARS2.SampleNo
FROM TblSamples AS ARS2
WHERE ISNUMERIC(ARS2.SampleID) = 0
GROUP BY 
     ARS2.SampleNo
    ,ARS2.SampleID
) AS A2
ON A1.SampleNo=A2.SampleNo

我的查询结果

预期结果：

Cartesian product Formula: 非数字 SampleID X 数字 SampleID 每个 SampleNo

例子：

所有样品编号137。我们在 SampleID 列中有两个数值（277 和 278）和一个不同的非数值（R00137）。那么这个非数字值（R00137）的 RealSampleID 将是 00277 和 00278。就像我们在上面的图像输出中看到的一样。

Answer 1

如果没有样本数据，这可能不是您想要的，但这是笛卡尔积：

SELECT A1.*
   ,RIGHT('00000' + A1.SampleID,5) AS [RealSampleID]
FROM
(
SELECT 
    ARS1.SampleID
   ,ARS1.SampleNo
FROM TblSamples AS ARS1
GROUP BY 
     ARS1.SampleNo
    ,ARS1.SampleID
) AS [A1],
(
SELECT 
    ARS2.SampleID
   ,ARS2.SampleNo
FROM TblSamples AS ARS2
WHERE ISNUMERIC(ARS2.SampleID) = 0
GROUP BY 
     ARS2.SampleNo
    ,ARS2.SampleID
) AS A2