Kusto query language contains This guide will teach you the basics of KQL, including its syntax and commands, to help you effectively analyze your data. Nov 21, 2024 · Applies to: Microsoft Fabric Azure Data Explorer Azure Monitor Microsoft Sentinel Filters a record set for data with any set of case-insensitive strings. KQL is not to be confused with the Lucene query language, which has a different feature set. Key Takeaways Kusto Query Language (KQL) is a read-only query language optimized for real-time data analysis, operating on structured and semi-structured data. One of the . The less data is processed, the quicker the query (and the fewer resources it consumes). 1. In this blog post, we will learn which string operator to use and when to use. A term is a sequence of alpha-numeric characters (see What is a Jan 9, 2023 · The second course is Kusto Query Language: Beginning Operators. Because Learn about how to use Kusto Query Language (KQL) to explore data, discover patterns, identify anomalies, and create statistical models. Notice that we put the comparison between two columns last, as the where operator can't use the index and forces a scan. Why should we prefer has over contains in some scenarios? TL;DR: performance (use of index vs. Use KQL to filter documents where a value for a field exists, matches a given value, or is within a given In today’s data-driven world, it’s more important than ever to be able to quickly and efficiently find the information you need. Aug 5, 2021 · Is there a way to make the contains clause take multiple values just with the common string part irrespective of the date and timestamp information that follows? Jun 9, 2025 · A query's performance depends directly on the amount of data it needs to process. has_any searches for indexed terms, where an indexed term is three or more characters. Therefore, the most important best-practice is to structure the query in such a way that reduces the amount of data being processed. KQL Serverless Stack The Kibana Query Language (KQL) is a simple text-based query language for filtering data. One of the most powerful tools for doing this is KQL, or Kusto Query Language. Mar 10, 2025 · Kusto Query Language (KQL) offers various query operators for searching string data types. Jun 5, 2025 · Kusto Query Language (KQL) is essential for querying large datasets within Azure Data Explorer. If your term is fewer than three characters, the query scans the values in the column, which is slower than looking up the term in the term index. Kusto Query Language (KQL) is a powerful tool for querying data in Microsoft Sentinel and Azure Data Explorer. Dec 16, 2022 · contains will always return true if the searched string exists within the searched text. For more Jul 26, 2022 · I'm executing a KQL that filters all rows such that some column (that is of type list of string) contains any of the values in some given list of strings. KQL is a powerful query language that can be used to query data from a variety of sources, including Azure Data Lake Storage Gen2, Azure Data Explorer, and Azure Cosmos DB. Introduction Kusto Query Language (KQL) is Microsoft's powerful open-source query language designed for analyzing large volumes of structured, semi-structured, and unstructured data. Sep 26, 2024 · Non-members can read the blog through this link. data scan). We will also learn some basic queries to discover the amount of data in a Log Analytics Workspace. Originally developed for internal Microsoft use and released publically with Azure Data Explorer, KQL is now the standard query language across Microsoft's analytics, security and monitoring ecosystem. Using contains Instead of has for Exact Aug 12, 2024 · The following query returns storm records that report damaged property, are floods, and start and end in different places. When working with KQL we're usually using many commands, wether its from functions through statement and operator. Basi Sep 19, 2020 · Kusto Query Language (aka KQL) offers a multiple query operators for searching string data types. Jul 21, 2020 · real world examples for Log Analytics operators Has, Contains and In, a comparison and when you should use each operator in Kusto Query Language. For Sep 15, 2025 · KQL quick reference Applies to: Microsoft Fabric Azure Data Explorer Azure Monitor Microsoft Sentinel This article shows you a list of functions and their descriptions to help get you started using Kusto Query Language. KQL only filters data, and has no role in aggregating, transforming, or sorting data. This blog will walk you through 10 common errors and, more importantly, how to avoid them. Key features of Feb 10, 2020 · Greetings Community, I'm trying to come up with a way to query for multiple computers, but I have different strings to search for. has result depends on the surrounding of the searched string within the searched text. The following article describes how string terms are indexed, lists the string query operators, and gives tips for optimizing performance. KQL Cheat Sheet for Real Time Intelligence A comprehensive reference for Kusto Query Language (KQL) specifically tailored for Real Time Intelligence scenarios. May 25, 2025 · Learn how to use the contains operator to filter a record set for data containing a case-insensitive string. The third course, to be published soon, is Kusto Query Language: Basic Scalar Operators and it contains video instruction for the operators discussed in this blog post. However, even experienced users can make mistakes. The basic string operators that we can use are: == has contains startswith endswith matches regex has_any In the SQL to KQL blog post, we used the evaluation data of the MITRE ATP29 test to test our queries. rdevgn zwbf doxjr gwtuzcq gukqlu rfxwc ollfw rwsm uusjnx gfy ctyai ztfxrcglw wifcepir ilkf jymmi