The Entity-Relationship (ER) model was originally proposed by Peter in 1976 as a way to unify the network and relational database views. Simply stated the ER model is a conceptual data model that views the real world as entities and relationships. A basic component of the model is the Entity-Relationship diagram which is used to … Read more
A data model is a conceptual representation of the data structures that are required by a database. The data structures include the data objects, the associations between data objects, and the rules which govern operations on the objects. As the name implies, the data model focuses on what data is required and how it should … Read more
CSS Selectors CSS selectors allow you to select and manipulate HTML element(s). CSS selectors are used to “find” (or select) HTML elements based on their id, classes, types, attributes, values of attributes and much more. 1. The element Selector The element selector selects elements based on the element name.You can select all <p> elements on … Read more