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Interface Summary |
| AntiJoin |
An extension to DyadicJoin - use to differentiate itself from other DyadicJoins The complement of semijoin. |
| DyadicJoin |
Merely a marker interface - used to differentiate between two types of join. |
| NadicJoin |
Merely a marker interface - used to differentiate between two types of join. |
| Operation |
Base interface. |
| Project |
Derives a new relation by removing attributes. |
| Restrict |
Returns the list of relations with the same set of attributes. |
| SemiDifference |
A more general form of difference - maybe replace by more basic operations
(Not and Join for instance). |
| Union |
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