Transitive functional dependency: is satisfied if:
B% / A => A C
3rd normal form: it is said that a table is in 3rd normal form if it is in 2nd normal form and further
holds that no non-key attribute transitively depends key.
It is said that a T formed by the attributes A1, A2, ., An has a dependency on their projections
T1, T2, ., Tn if T = T1 T2 T3 . Tn
T <> T1 T2
Functional dependence derived
Given a set F of said functional units are derived from F f (F% f) where f is obtained from F.
Closure of a set of functional dependencies
Close (F +) is defined as the set of all functional dependencies implied by F or found
Defined for retrieving, using a single query, information Obtained from a query more d.
Each SELECT returns a set of rows. The junction will be the result table.
Semirigid AND RIGID ROTOR
Semirigid rotors blades are not articulated on the hub, which is the set as a whole can be tilted
by means of a universal joint connecting the hub with the axis (of course, have only two semirigid blades).
If you think this type
THEORY OF STANDARDIZATION
We will use the following table:
Bibliography: Design and Management of Databases
1. SQL self
2. SQL embeded
SQL statement that is used within a program called host, written in any language.
We will have tables with input and output.
The SQL statements are embedded manual in the host program.
* All SQ
OVERVIEW OF HELICOPTERS
A helicopter flies by the same principles as a plane, but in the case of helicopters lift is achieved
by rotation of the blades. The blades are the structure that make the lift possible. Its shape
produces lift when air pa
INTEGRITY INTEGRITY AND REFERENCE
2. Referential Integrity
4. Semantic Rules
Integrity: feature that allows us to have consistency and accuracy in reporting.
There are certain SQL operations that
An aerodynamic force is generated when an air current flows over and below a profile. The point
where this stream is divided is called "point of impact". Now, what do you call aerodynamic force
?. Aerodynamic force is the resultant of tw