Isempty
Query
SecurityAlert
| where isempty(ProviderName)
| project AlertName, SourceComputerId, ProviderNameExplanation
This query is looking at a table called SecurityAlert and filtering out any rows where the ProviderName column is empty. It then selects and displays the AlertName, SourceComputerId, and ProviderName columns from the remaining rows.
Details

Rod Trent
Released: March 26, 2020
Tables
SecurityAlert
Keywords
SecurityAlertProviderNameAlertNameSourceComputerId
Operators
whereisemptyproject