我正在尝试构建一个查询,该查询可以将组合的产品描述、颜色和尺寸拆分为各自的值。我有一张桌子,里面全是产品描述、颜色和尺寸。一些产品描述包含颜色和尺寸,每个都用特定的字符串分隔。一些颜色和尺寸包含在它们自己的列中。很多时候,描述和颜色/大小列都包含颜色/大小值。结合颜色和尺寸的常见产品描述如下所示: ProductDescription..-..Color--.--Size 其中 Color 由“..-..”分隔,Size 由“--.-- 分隔” ”。有时颜色和/或大小不存在,查询没有分隔符来引用,但我仍然希望它拆分描述/颜色或描述/大小,
描述和尺寸分离得很好,但我在颜色方面遇到了问题。我收到以下错误:
Invalid length parameter passed to the LEFT or SUBSTRING function.
任何帮助将非常感激!
这是我到目前为止不起作用的内容:
Select
Ps.ID
,Case
When Ps.ColorStart <= 5 And Ps.SizeStart <= 5 Then Ps.Description
When Ps.ColorStart <= 5 And Ps.SizeStart > 5 Then Left(Ps.Description, Ps.SizeStart - 6)
When Ps.ColorStart > 5 Then Left(Ps.Description, Ps.ColorStart - 6)
Else Ps.Description
End As DescriptionWithoutColorAndSize
,Case
When Ps.PColor Is Not Null And Ps.PColor <> '' Then Ps.PColor
When Ps.ColorStart <= 5 Or Ps.Description Is Null Or Ps.Description = '' Then ''
When Ps.SizeStart <= 5 And Ps.ColorStart > 5 Then SUBSTRING(Ps.Description, Ps.ColorStart, 299)
When Ps.SizeStart > 5 And Ps.ColorStart > 5 Then SUBSTRING(Ps.Description, Ps.ColorStart, Ps.ColorEndIfSizeExists - Ps.ColorStart + 1)
--The prior line is what fails
Else ''
End As Color
,Case
When Ps.PSize Is Not Null And Ps.PSize <> '' Then Ps.PSize
When Ps.SizeStart <= 5 Then ''
Else SUBSTRING(Ps.Description, Ps.SizeStart, 299)
End As Size
From
(
Select
P.ID
,P.Description
,P.Color As PColor
,P.Size As PSize
,CHARINDEX('..-..',P.Description,0) + 5 As ColorStart
,CHARINDEX('--.--',P.Description,0) -1 As ColorEndIfSizeExists
,Len(P.Description) As ColorEndIfSizeDoesNotExist
,CHARINDEX('--.--',P.Description,0) + 5 As SizeStart
From
MYProductsTable P
) Ps