如何在 Kusto 数据库的连接条件中将列转换为小写

Question

TableA
| where GuidId == "123"
| where Desc has_any ("processor")
| join kind=leftouter TableB on 
  $left.SubId == $right.SubId,  
  $left.ProductName == $right.Name,
  $left.GuidId == $right.GuidId
| distinct SubId, PriceTags, ResourceType, ProductName, Name

ProductName为小写，Name为驼峰式。如何在 Join 条件下将 ProductName 和 Name 带到同一个 case。

谢谢

Answer 1

类似于：

|扩展 Name=tolower(Name)

TableA 
| where GuidId == "123" 
| where Desc has_any ("processor") 
| join kind=leftouter (TableB | extend Name=tolower(Name)) on $left.SubId == $right.SubId, $left.ProductName==$right.Name, $left.GuidId==$right.GuidId 
|distinct SubId, PriceTags, ResourceType, ProductName, Name

扩展 Name=tolower(Name)

Answer 2

您需要 'normalize' join 之前的值。

理想情况下，您将在摄取之前或摄取时（使用更新策略）执行此操作。
鉴于当前的非规范化值，您可以在查询时执行此操作（性能将不是最佳的）：

TableA
| where GuidId == "123"
| where Desc has "processor"
| join kind=leftouter (
    TableB
    | extend Name = tolower(Name)
) on 
  $left.SubId == $right.SubId,  
  $left.ProductName == $right.Name,
  $left.GuidId == $right.GuidId
| distinct SubId, PriceTags, ResourceType, ProductName, Name

如何在 Kusto 数据库的连接条件中将列转换为小写

How to convert the columns to lowercase in join condition in Kusto Database

join

case

conditional-statements

azure-data-explorer