This KQL query is designed to identify devices that are not compliant with certain security configurations. Here's a simple breakdown of what it does:

1. Data Source: It starts by accessing two tables: DeviceTvmSecureConfigurationAssessment and DeviceTvmSecureConfigurationAssessmentKB.

2. Joining Tables: It performs an inner join between these two tables using the ConfigurationId as the key. This means it combines rows from both tables where the ConfigurationId matches.

3. Filtering: The query filters the results to include only those configurations that are not compliant (IsCompliant == 0) but are applicable (IsApplicable == 1) to the device.

4. Summarizing Data: For each device (DeviceName), it calculates:

   • ConfigurationImpactScore: The total impact score of all non-compliant configurations by summing up their individual impact scores (ConfigurationImpact).
   • ImpactedConfiguration: A set of names of the configurations that are non-compliant.
   • ConfigID: A set of IDs of the configurations that are non-compliant.

5. Sorting: Finally, it sorts the devices by their ConfigurationImpactScore in ascending order, so you can see which devices have the highest impact from non-compliance.

In summary, this query helps identify and prioritize devices based on the impact of their non-compliant security configurations.