What is the result of a Full Outer Join between two pipelines?

A Full Outer Join is a type of join that combines the results of both a Left Outer Join and a Right Outer Join. This means that it will return all records from both tables involved in the join, merging them based on matching criteria, and filling in gaps with null values when there are no corresponding matches in one of the tables.

The significance of this join type is that it delivers a comprehensive view of the data, ensuring that no records from either pipeline are lost in the output, even if they do not have counterpart entries in the other pipeline. When there are matches present, the matched rows are returned as they are, while any rows without a match in either table will still appear in the results, enhanced by nulls in the columns pertaining to the opposite table.

This behavior illustrates the utility of Full Outer Joins in data analysis, particularly when it’s crucial to retain all information rather than losing potentially valuable context due to non-matching records. Thus, the assertion that a Full Outer Join returns all rows with nulls populated for non-matches accurately captures its fundamental function.