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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