Base and Derived Relations
In a relational database, all data are stored and accessed via relations. Relations that store data are called "base relations", and in implementations are called "tables". Other relations do not store data, but are computed by applying relational operations to other relations. These relations are sometimes called "derived relations". In implementations these are called "views" or "queries". Derived relations are convenient in that they act as a single relation, even though they may grab information from several relations. Also, derived relations can be used as an abstraction layer.
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“Things base and vile, holding no quantity,
Love can transpose to form and dignity.
Love looks not with the eyes, but with the mind,
And therefore is winged Cupid painted blind.”
—William Shakespeare (1564–1616)
“For those who are base in judgement do not know the good they hold in their hands until they cast it off.”
—Sophocles (497–406/5 B.C.)
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—Thomas Jefferson (1743–1826)
“Subject the material world to the higher ends by understanding it in all its relations to daily life and action.”
—Ellen Henrietta Swallow Richards (1842–1911)