Description

Data models are foundational in database management systems (DBMS), defining the logical structure and relationships within databases. They abstractly depict how data is interconnected, processed, and stored within the system. A database organizes data to reflect real-world aspects that support operational processes, such as managing hotel room availability. Early data models, like flat data-models, stored all data on a single plane, leading to duplication and update issues. The physical data model translates the relational data model into a practical implementation. Data in databases resides physically on secondary storage devices, organized as files, records, and other structures. This model specifies how tables are stored in memory for efficient access. Structured Query Language (SQL) is pivotal in implementing relational algebra practically. This comprehensive textbook caters to students, educators, scholars, and general readers alike, offering insights into the principles and applications of data modeling in DBMS.