The results are unchanged: let LightningStorms = Use let to separate out the parts of the query expression in the preceding join example. The query removes zero count entries: StartTime | project StartTime, InjuriesDirect, InjuriesIndirect, Percentage | extend Percentage = ( 100 * InjuriesDirect / (InjuriesDirect + InjuriesIndirect) ) | where duration 0) and (InjuriesIndirect > 0) | where StartTime > datetime() and StartTime 0s Use multiple values in a summarize by clause to create a separate row for each combination of values: StormEvents | summarize event_count=count() by bin(StartTime, 1d) Going back to numeric bins, let's display a time series: StormEvents Still, it's integrated into the language, and it's useful for envisioning your results. Strictly speaking, render is a feature of the client rather than part of the query language. | where StartTime > datetime() and StartTime datetime() and StartTime 1800Īlthough we removed mid in the project operation, we still need it if we want the chart to display the states in that order. Let's see only flood events in California in Feb-2007: StormEvents See the following example, which uses both the projectĪnd the take operators. Use project to pick out only the columns you want. StormEvents | countįor more information, see count operator. Syntax note: A query is a data source (usually a table name), optionally followed by one or more pairs of the pipe character and some tabular operator. So we'll pipe its content into an operator that counts the rows in the table. we want to find out how large the table is. Our example database has a table called StormEvents. The StormEvents table in the sample database provides some information about storms that happened in the United States. The queries that are demonstrated in this tutorial should run on that database. We recommend using a database with some sample data. The best way to learn about the Kusto Query Language is to look at some basic queries to get a 'feel' for the language.

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