Table (Relation): A collection of data organized into rows (records) and columns (attributes). Each table represents an entity or relationship within the database.
Primary Key: A unique identifier for each record within a table, ensuring entity integrity. Example: CustomerID in a Customers table.
Foreign Key: A field (or set of fields) in one table that references the primary key in another table, establishing a relationship between the two tables.
Relationship Types:
Normalization: The process of organizing data to reduce redundancy and dependency by dividing data into related tables, following normal forms (1NF, 2NF, 3NF).
1. What is the relational database model primarily characterized by?
2. In the context of relational databases, what is the primary key in the 'Customers' table typically called?
3. What is the primary role of relationship types in a relational database?
Relational Database Model — core concept?
Organizes data into related tables using keys.
Tables and Keys — purpose?
Define data structure and relationships.
Relationship Types — examples?
One-to-one, one-to-many, many-to-many.
Table — definition?
Collection of related data organized in rows and columns.
Primary Key — role?
Unique identifier for each record in a table.
Foreign Key — purpose?
Establishes relationship by referencing another table's primary key.
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