An **RdbRelation** is a set of RdbTuples that all have the same RdbHeading. To be an RdbRelation, the order of the RdbTuples cannot matter, and every RdbTuple must be unique.

RdbRelation <==> table. Is this correct? Am I missing something here?

*A relation is not a table. A relation is a value that a table -- or more accurately, a relation variable (RelVar for short) -- can have at a given point in time. An integer variable has a given integer value at a given point in time. Similarly, a relvar has a given relation value at a given point in time. Like this:*

Variable category Variable type Value example ----------------- ------------------------------- ------------------------------------------------- Scalar Integer 3 Scalar String 'Dave' Relvar relation {x integer, y integer} relation {tuple {x 1, y 2}, tuple {x 2, y 3}}Therefore, the closest translation for "table" is to say relvar <==> table.

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