Discover the number of columns returned and the data type of the Duration column when executing the provided KQL query. Get a detailed explanation from an AZ-104 certification exam expert.
Table of Contents
Question
You are interrogating logs by using KQL.
You execute the query shown in the following exhibit.
Use the drop-down menus to select the answer choice that completes each statement based on the information presented in the graphic.
__________ columns will be returned in the query output.
- One
- Five
- Six
- Seven
The data type of the Duration column is __________ .
- datetime
- integer
- string
- timespan
Answer
Six columns will be returned in the query output.
The data type of the Duration column is timespan.
Explanation
Based on the KQL query shown in the image, six columns will be returned in the query output. The query selects the following columns: StartTime, EndTime, EpisodeId, State, Level=substring(StormSummary, 1, 100), and Duration = EndTime – StartTime. Since six columns are explicitly selected and there are no additional transformations or aggregations that would reduce the number of columns, the output will contain six columns.
The data type of the Duration column is timespan. This can be determined from the way the Duration column is calculated in the query. The Duration column is defined as “EndTime – StartTime”. Both EndTime and StartTime appear to be datetime values based on their names. When subtracting one datetime value from another in KQL, the result is a timespan value representing the time duration between those two points in time. Therefore, the Duration column will have the timespan data type.
In summary, the KQL query will return six columns in the output, and the Duration column will have the timespan data type, representing the time duration between the EndTime and StartTime for each row.
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