L’integrazione dei dati serve a unire fonti diverse in un’unica interfaccia, rendendo l'analisi automatica e veloce anche con volumi massicci di informazioni.
Il processo parte dalla ricerca di fonti credibili e comparabili, per poi passare all'ETL: si estraggono i dati (via API o download), si trasformano per renderli omogenei e si caricano nel sistema. Fondamentale è la mappatura tramite ID: un sistema centralizzato (come il Codice Fiscale) è flessibile ma richiede continue operazioni di
DATABASE INTEGRATO : raccolta di dati, informazioni organizzate e gestite utilizzando il linguaggi di interrogazione SQL.
Perchè creare un database integrato ? La versione coerente e normalizzata di tutti i dati è utile in caso di grandi quantità di dati come nell'analisi dei Big data. Infatti l'integrazione consente di operare meglio attraverso operazioni sequel per confrontare diverse database
step 1 : ricerca delle fonti : da fonti ufficiali come istituiti di statistico, e verificare se
A system transforms input u(t) into output y(t). It can be continuous/discrete, linear/nonlinear, time-invariant/time-variant.
Signals: continuous/discrete, periodic/aperiodic, deterministic/random, energy/power signals.
Open loop: no feedback, control does not depend on output → simple but sensitive to disturbances/parameter changes.
Closed loop: uses feedback (compare reference r with output y, error e=r−y) → better accuracy
Relational model stores data in tables (relations): rows = tuples, columns = attributes.
Key components: tables, attributes, tuples, constraints (PK/FK/UNIQUE/NOT NULL).
Mapping ER → relational: entity → table, 1:many → FK on many side, many:many → junction table, multivalued attribute → separate table.
Functional dependency (FD): X → Y means X uniquely determines Y (same X → same Y).
Armstrong axioms: reflexivity (if
Q1 (b) How can you map a conceptual model to a relational model?
Mapping a conceptual (ER) model to a relational model is done by:
Converting entities into tables
Converting attributes into columns
Defining primary keys for each table
Representing relationships using foreign keys
Q1 (c) What is the use of DML in DBMS?
DML (Data Manipulation Language) is used to retrieve and manipulate data in database tables.
Examples: SELECT, INSERT, UPDATE, DELETE.
(d) List two reasons why we may choose to define
Analys av När hundarna kommer av Jessica Schiefauer
I denna text ska jag analysera romanen ”När hundarna kommer” från 2015, skriven av Jessica Schiefauer. Boken handlar om Ester, en tonårstjej som bor i en liten stad, och hennes relationer till andra, bland annat hennes pojkvän Isak, familj och vänner. Parallellt får vi följa Anton, Isaks bror, som utvecklas mycket under berättelsens gång. Romanen tar upp flera viktiga teman, bland annat kärlek och beroende, våld och identitet. Och
Chapter -1
electric field:-the sphere arround a source change in which a test charge would experience a force is called electric field.
Electric field lines: An electric field is represented by same emajinary lines of force which are called electric field.
properties:-1)they are emajinary lines of force.
2)in case of positive source change they are readily directed outward.
3) they are not closed line.
mathematically define of electric field:- the electric force per unit test charge is called
1. Right to Equality (Articles 14–18)
This right ensures equality before law and equal protection of laws to all persons. It prohibits discrimination on grounds of religion, race, caste, sex or place of birth. It also abolishes untouchability and titles.
Limitations:
Equality does not mean absolute equality. The State can make reasonable classification and special provisions for women, children, Scheduled Castes, Scheduled Tribes and Other Backward Classes.
2. Right to Freedom (Articles 19–22)...
A chemical reaction is a process in which one or more substances, known as reactants, undergo a transformation to form new substances with different chemical properties, known as products. During a chemical reaction, the arrangement of atoms in the reactants changes, leading to the creation of new bonds and the breaking of old ones. Chemical reactions are fundamental to understanding how matter interacts and changes in the world around us.
For example, hydrogen gas combines with