Что (кто) такое Codd's Laws - определение
RELATIONAL DATABASE DESIGN
Codd's twelve rules; Codd's rules; Codd rules; Codds laws; Codd's 12 Rules
Codd's 12 rules
Codd's twelve rules are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be considered relational, i.
Laws (dialogue)
PLATONIC DIALOGUE
The Laws; Plato's Laws; Laws (Plato); Cleinas; The Laws (Plato)
The Laws (Greek: Νόμοι, Nómoi; Latin: De LegibusHenri Estienne (ed.), Platonis opera quae extant omnia, Vol.
Codd's theorem
THEOREM OF EXPRESSIVE EQUIVALENCE BETWEEN RELATIONAL LANGUAGES
Codd's Theorem
Codd's theorem states that relational algebra and the domain-independent relational calculus queries, two well-known foundational query languages for the relational model, are precisely equivalent in expressive power. That is, a database query can be formulated in one language if and only if it can be expressed in the other.
Википедия
Codd's 12 rules
Codd's twelve rules are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be considered relational, i.e., a relational database management system (RDBMS). They are sometimes referred to as "Codd's Twelve Commandments".
