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Ríomhairí, Ríomheolaíocht Gaol amháin a chruthú ó dhá ghaol, atá comhdhéanta de gach uile chodach ar teaglaim iad de dhá chodach, ceann ó gach aon cheann den dá ghaol ionas go bhfuil luach coiteann ag an tréith choiteann.
Computers, Computer Science Create one relation from two relations, made up of every tuple which is a combination of two tuples, one from each of the two relations so that the common attribute has a common value.