Azure Information Explorer – Working With Kusto Case Sensitivity

Like most different programming and question languages, Kusto case sensitivity, which suggests it will probably take care of upper-case and lower-case whereas performing comparisons between values.


Let’s contemplate the beneath pattern knowledge:

  1. let demoData = datatable(Surroundings: string, Characteristic:string)  
  2. [    
  3.    “dev”“Feature1”,  
  4.    “test”“Feature1”,  
  5.    “prod”“Feature1”,  
  6.    “Dev”“Feature2”,  
  7.    “test”“Feature2”,  
  8.    “dev”“Feature3”,  
  9.    “test”“Feature3”,  
  10.    “prod”“Feature3”    
  11. ];  

Case Delicate Comparability


Case delicate means the matches needs to be actual, higher case letters should match with upper-case solely and the identical for lower-case. Every time a match is carried out between an upper-case character and a lower-case character, a question will return false, though each of the characters are similar. For instance, dev and Dev should not similar.


Question description


Get the checklist of options, which belongs to the dev surroundings.



  1. demoData| the place Surroundings == “dev”  

As “==” stands for case delicate comparability, the above question will end result within the beneath output,



Case Insensitive Comparability


Case insensitive comparisons behave in a totally reverse trend as case delicate comparisons. Every time the match is carried out between an upper-case character and a lower-case character, the question will return true, so long as each of the characters are the identical. For instance, dev and Dev are the identical.


Now, to attain this conduct there are a number of approaches.




On this strategy, one can first convert the string utilizing the toupper(…) or tolower(…) capabilities after which carry out the comparability as proven beneath,

  1. demoData| the place tolower(Surroundings) == “dev”  

Strategy 2


On this strategy, there is no such thing as a must name any further perform,  because the inbuilt operator will do that for us as proven beneath,

  1. demoData| the place Surroundings =~ “dev”  

Right here “=~” performs the case-insensitive comparability.


Execution of each the above queries leads to the identical output as proven beneath,



Efficiency Tip

  • At all times choose case-sensitive over case-insensitive, wherever doable.
  • At all times choose has or in over accommodates.
  • Keep away from utilizing brief strings because it impacts indexing. 

Pleased kusto-ing!

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