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Showing posts from January 13, 2024

Normalization in Databse Design

  Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. The normalization process involves breaking down large tables into smaller, related tables and defining relationships between them. The goal is to eliminate data anomalies and ensure that the database structure is efficient, scalable, and maintains data integrity. There are several normal forms (NF) in database design, each addressing different aspects of data organization. The most commonly discussed normal forms are: 1. First Normal Form (1NF):    - Eliminates duplicate columns from the same table.    - Each column must contain atomic (indivisible) values.    - Each column must have a unique name. 2. Second Normal Form (2NF):    - Satisfies 1NF.    - Eliminates partial dependencies, ensuring that no column is dependent on only a portion of a multi-column primary key. 3. Third Normal Form (3NF):    - Satisfies...

SQL for Data Engineer

SQL, or Structured Query Language , is a powerful programming language designed for managing and manipulating relational databases. It serves as a standard interface for interacting with database management systems (DBMS), allowing data engineers to efficiently store, retrieve, and manipulate structured data. SQL provides a structured and intuitive approach to working with databases, making it an essential tool for data engineers. Data engineers leverage SQL to perform a variety of tasks, such as creating and modifying database schemas, inserting and updating data, and querying information for analysis. Its versatility allows professionals to define, control, and maintain the integrity of databases, ensuring efficient and organized storage of data. The significance of SQL in the realm of data engineering cannot be overstated. Its declarative nature enables engineers to focus on what needs to be achieved rather than the detailed steps to achieve it. SQL simplifies complex operations li...