yKey</a></th>
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<div class="block">A primary key of a relation, specified either as a single column, or as a list of columns</div>
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<th class="colFirst" scope="row"><a href="Relation.html" title="class in hydra.ext.relationalModel">Relation</a>&lt;V&gt;</th>
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<div class="block">A set of distinct n-tuples; a table</div>
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<th class="colFirst" scope="row"><a href="RelationName.html" title="class in hydra.ex