Essential Database and Data Management Concepts

Posted by on Jul 17, 2025 in Commercialization and Logistics | 0 comments

Database Fundamentals

Core Database Terminology

  • Catalog: A set of schemas that constitute the description of a database.
  • Schema: The structure that contains descriptions of objects created by a user (base tables, views, constraints).
  • Data Definition Language (DDL): Commands that define a database, including creating, altering, and dropping tables and establishing constraints.
  • Data Manipulation Language (DML): Commands that maintain and query a database.
  • Data Control Language (DCL): Commands that control
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Database Keys: Super, Candidate, Primary & 3NF Concepts

Posted by on May 7, 2025 in Commercialization and Logistics | 0 comments

Super Key vs. Candidate Key Differences

Understanding the distinctions between Super Keys and Candidate Keys is crucial in database design. Below are their key characteristics:

Super Key Characteristics

  • A Super Key is an attribute (or set of attributes) used to uniquely identify all attributes in a relation.
  • Not all Super Keys can be Candidate Keys.
  • The collection of Super Keys helps establish the criteria for selecting Candidate Keys.
  • In a relation, the number of Super Keys is typically greater than
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SQL and Relational Database Concepts Assessment

Posted by on Mar 31, 2025 in Commercialization and Logistics | 0 comments

SQL and Database Concepts Questions

  1. Which of the following will fix one of the issues with the SQL statement in Figure 1a?
    1. StudentID, CRN AUTO_INCREMENT PRIMARY KEY
    2. PRIMARY KEY (StudentID)
    3. FOREIGN KEY (StudentNum) REFERENCES Housing (DormNum)
    4. (StudentID) AUTO_INCREMENT PRIMARY KEY
    5. DELETE TABLE Students
  2. Which of the following is true about Figure 3?
    1. The tables have too many primary keys (PKs)
    2. It uses Chen’s notation
    3. It uses SQL, not ANSI
    4. It uses Crow’s Foot notation
    5. It is a Database Management System (DBMS)
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Database Partitioning: Principles, Methods, and Features

Posted by on Mar 24, 2025 in Commercialization and Logistics | 0 comments

Database Partitioning Principles

Completeness: Every piece of data in the original table must appear in at least one partition.

Why? This ensures no data is lost during the partitioning process.

Example: If a Customers table is partitioned into regions, all customers must belong to one of the regional partitions.

Reconstruction: It must be possible to reconstruct the original table by combining the partitions.

Why? This ensures that partitioning doesn’t make it impossible to retrieve the full dataset

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Database Concepts and Design Principles

Posted by on Mar 14, 2025 in Commercialization and Logistics | 0 comments

What is a Database?

  • A database is a logically organized collection of data with inherent meaning, representing some aspect of the real world and designed for a specific purpose.
  • It is designed, built, and populated with data for a specific purpose and has an intended group of users and applications.

Early Databases

  • Record-keeping predates computers, with early forms like clay tablets and manual filing systems.
  • Computerized file-based systems initially mimicked manual filing systems, storing related data
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Database Schema Design: Relational Model Essentials

Posted by on Mar 11, 2025 in Commercialization and Logistics | 0 comments

Conceptual Diagram

Representation of information resources regardless of system users or particular applications and without regard to efficiency issues. It is normally supported by the E/R model.

Logical Schema Global/External

Transformation of the conceptual framework adapted to the data model which supports the DBMS to be used, obtaining a Global Logical Data Schema. The most common is the relational model.

Internal or Physical Schema

Instrumentation as efficiently as possible the logical schema in

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