Row Arrangement Join
Question
You are a SOC Analyst working at a company that is deploying Azure Sentinel.
You are in charge for performing log data analysis to search for malicious activity, display visualizations, and perform threat hunting.
To query log data, you use the Kusto Query Language (KQL)
Often a result set from a KQL statement needs to be combined or joined with another result set.
You need to understand how the order of a KQL statement impacts your expected results.
Which join comprises a row in output for every arrangement of identical rows from left and right?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer: C Option C is correct.
Inner contains a row in the output for every combination of matching rows from left and right.
Option B is incorrect.
Leftouter contains a row for every row on the left and right, even if it has no match.
Option A is incorrect.
Fullouter contains a row for every row on the left and right, even if it has no match.
Reference:
The join that comprises a row in the output for every arrangement of identical rows from left and right is the full outer join, which is denoted by kind=fullouter in Kusto Query Language (KQL).
A join operation combines rows from two or more tables based on a related column between them. In KQL, there are four types of joins that can be used to combine data: inner join, left outer join, right outer join, and full outer join. Each join type returns a different set of results based on how the rows from the joined tables are matched and combined.
An inner join returns only the rows that have matching values in both tables. A left outer join returns all the rows from the left table and only the matching rows from the right table. A right outer join returns all the rows from the right table and only the matching rows from the left table. A full outer join returns all the rows from both tables, and for any rows that don't have a match in the other table, NULL values are returned.
In a full outer join, every row from both tables is included in the result set, even if there is no matching value in the other table. This means that if there are multiple identical rows in the left table and multiple identical rows in the right table, the result set will contain a row for every possible combination of those identical rows. This can result in a larger result set than the other join types and may require additional filtering or aggregation to get the desired output.
In summary, the full outer join (kind=fullouter) in KQL returns a row in the output for every arrangement of identical rows from left and right tables, including those with no matching values in the other table.
