What is the key characteristic of a right join transformation?

The key characteristic of a right join transformation is that it retains all rows from the right table and includes matching rows from the left table. When there is no corresponding match in the left table for a given row in the right table, the result will still include that row from the right table, with NULL values for the columns coming from the left table. This helps ensure that the results reflect all the entries in the right table, regardless of whether they have corresponding matches in the left table or not. Thus, the additional rows created fill in for those without matching values, enriching the dataset with all possible information from the right side of the join.

This approach contrasts with some other types of joins where certain rows may be filtered out. Retaining all right rows is essential in scenarios where it is important to analyze all available data or maintain context from the right table, which is often a primary concern in data reporting and analysis contexts.