Type of relations in a extended relational algebra.
Assembly: Epic.Query
Declaration Syntax
| C# |
[SerializableAttribute] public enum RelationType
Members
| Member | Description |
|---|---|
| BaseRelation |
Base Relation (in SQL, tipically a table).
|
| NaturalJoin |
Natural join (in SQL, an INNER NATURAL JOIN).
|
| Selection |
Selection (in SQL, the relation produced by a WHERE statement).
|
| CrossProduct |
Cross product (in SQL, a cross join).
|
| Projection |
Projection (in SQL, the relation produced by a SELECT statement)
|
| Union |
Union.
|
| Rename |
Rename.
|
| ThetaJoin |
Theta Join.
|
| OuterJoin |
Outer Join.
|
| Sort |
Sort.
|
| Grouped |
Grouped relation (in SQL, it's the effect of a group by)
|
| Function |
Relation originated by a function.
|