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. What is the primary purpose of a primary key in a relational database table?
3. In the context of relational databases, what is the primary key in the 'Customers' table typically called?
Relational Database Model — core concept?
Organizes data into related tables using keys.
Table — definition?
Collection of related data organized in rows and columns.
Tables and Keys — purpose?
Define data structure and relationships.
Primary Key — role?
Unique identifier for each record in a table.
Relationship Types — examples?
One-to-one, one-to-many, many-to-many.
Foreign Key — purpose?
Establishes relationship by referencing another table's primary key.
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