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A natural join allows the database to attempt to determine relationships on behalf of the programmer by comparing column names and joining on those fields. It only shows columns once when they are duplicated in the tables, and operates on rows that contain matches in both tables (an "inner join").

A outer join will show results for any matching rows, even if one of the two tables does not contain a matching record. In those events, the empty table's fields will be "null", since no match was found. Depending on the type of outer join, either table a will always have a record, table b will always have a record, or either table may not have a record (but at least one record is required per row to generate a row).

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