natural key
(databases) A unique key formed from attributes that relate to the external world being modelled, rather than being an internally generated surrogate key.
Pawn, obligation as collateral for a loan. / Debt. / Installment purchase. / Prison.
plural of CLDC
Holding one's own self-interest as the standard for decision making. / Having regard for oneself above others’ well-being.
データベースを設計する際に、各レコードが実在の人物を表すように、顧客のメールアドレスを実世界の属性に由来する一意のキーとして選びました。
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