Kusto Query Language is a powerful intuitive query language, which is being used by many Microsoft Services. KQL Language concepts​   Relational operators (filters, union, joins, aggregations, …)​ Each operator consumes tabular input and produces tabular output​ Can be combined with ‘|’ (pipe).​ Similarities: OS shell, Linq, functional SQL…​ Ease to write, read, change​ Statements:​ Single statement query ​ Use ‘let’ for reusing statements​ Multi-statement (‘;’) queries​ official Azure Data Explorer KQL quick reference page - https://docs.microsoft.com/en-us/azure/data-explorer/kql-quick-reference   One of our customers released a cheat sheet for #KQL (Kusto Query Language). Download: https://github.com/marcusbakker/KQL/blob/master/kql_cheat_sheet_v01.pdf   Documentation: here  Free Online course - http://aka.ms/KQLPluralsight  Doc - https://aka.ms/adx.docs  Q&A  - StackOverFlow/TechCommunity