Final answer:
When an outer join is used, column data from tables or views with no matching rows will have null values.
Step-by-step explanation:
When an outer join is used in a database query, column data from tables or views in which no matching rows were found will contain null values. An outer join is a type of join that returns all rows from one table and the matched rows from the second table.
If there is no match, the result set will include null for each column from the table that lacks a matching row. For instance, in a left outer join between Table A and Table B, if there is a record in Table A that does not have a corresponding record in Table B.
All the columns from Table B will be included in the result set as null values. This ensures that the data from the table specified on the 'left' side of the join is still represented in the results, even if there is no corresponding data in the 'right' side table.