By Michel Léonard (auth.)
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The latter then appear in their 'derivation rule' role to permit the derivation of new fds of R from F. Since the number of attributes of R is finite, the set of all the fds that can be derived from F by repeated application of the derivation rules leads to a unique finite set of functional dependencies of R called the closure F** of F. This closure F** ofF is obtained using the derivation rules fdl, fd2 and fd3. The derivation rules fdl, fd2, and fd3 constitute a valid and complete system (ARMSI'RONG74)(BEERI FAGIN HOWARD77).
What does this involve? The entities of a relation are tuples of values that verify the predicate of the relation. But this verification is only the responsibility of a user at his terminal or a program operating on the database. It is one or other of these that decides whether or not a particular tuple is an entity. Because there is always some risk of a false step, designers and users wish to be protected against such risks. The nonvariables in the field of application, described in terms of integrity rules in the database, provide such protection: every alteration to the database will have to verify these integrity rules in order to be accepted.
NTEC technician number integer word (1,100). NAMTEC technician name text. ACTIVITY (NTEC NH ACTIVE). Predicate: technician number (NTEC) is active at the required time (NH) if he is not on leave at that time; otherwise he is inactive. ACTIVE state of activity word (active, inactive). hourly work shift integer word (1,8). NH MACHINE (NMH FUNCTION). Predicate: the machine number (NMH) identifies machines; each machine has a single function (FUNCTION). FUNCTION a machine's function word. machine number word.