what is an er diagram

August 03, 2026

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What is an Entity Relationship Diagram (ERD)? ERD stands for entity relationship diagram. People also call these types of diagrams ER diagrams and Entity Relationship Models. An ERD visualizes the relationships between entities like people, things, or concepts in a database. An ERD will also often visualize the attributes of these entities. By defining the entities, their attributes, and ... Learn What is an ER Diagram (ERD)? Explore the history of ER Diagrams, use of ER Diagrams, symbols and notations, examples, how to draw an ER Diagram and free ERD templates. Is it raining, or snowing, or what? Is this exciting, or what? A clever play, what? What you need is a vacation. What angered us was the tone of the article. What does he care? … what with the war, what with the sweat, what with the gallows, and what with poverty, I am custom-shrunk. William Shakespeare. What minerals do we export? What mountains! We can use what as a pronoun to mean ‘the thing (s) that’: … We can use what in exclamations to express a strong feeling or opinion. In this case, we use what as a determiner before a noun or before a/an (+ adjective) + noun: … What … for? We can use what … for? in two ways. (used interrogatively as a request for specific information). What is the matter? (used interrogatively to inquire about the character, occupation, etc., of a person). What does he do? (used interrogatively to inquire as to the origin, identity, etc., of something). What are those birds? For related background details, please refer to our report on series wiring vs parallel wiring. Used to express surprise, incredulity, or other strong and sudden excitement. 2. Chiefly British Used as a tag question, often to solicit agreement. Informal Used as an intensive at the end of a question: Is he crazy, or what? Are you a genius, or what? 1. A scolding or strong reprimand: The teacher gave the tardy student what for. 2.