DIFFERENT STRATEGIES FOR OR-TERMS 
DIFFERENT STRATEGIES FOR OR-TERMS is a search strategy of the SQL optimizer.
When Can the System Use This Strategy?
The database system can use this strategy for search conditions which are linked with OR.
How Does the System Access the Data?
The database system transforms the search conditions which are linked with OR, analyzes them and then chooses search strategies for the individual subconditions that are linked with OR.