Final answer:
In Oracle Proprietary join syntax, the operators 'AND' and '=' can be used with the outer join operator (+). The '+' sign is used to include rows with no direct match in the join.
Step-by-step explanation:
Using Oracle Proprietary join syntax, the two operators that can be used in an outer join condition with the outer join operator (+) are AND and =. In the context of Oracle databases, when performing an outer join, the + sign is placed on the side of the join that may contain the missing data. This allows for the inclusion of rows that do not have a direct match in the other table. It's important to use the correct syntax when applying outer joins with these operators, as the combination of AND and = in an outer join condition specifies how the data should be matched and what should be included even when there's no exact match.