You're reading from Data Modeling with Snowflake

Product typeBook

Published inMay 2023

PublisherPackt

ISBN-139781837634453

Edition1st Edition

Concepts

Data Engineering

Author (1)

Serge Gershkovich

RM versus entity-relationship diagram

Recall that an RM can be identified from business-relevant concepts and mapped onto a database schema that includes their attributes, identifiers, and relationships. An entity-relationship diagram (ERD) is a visual rendering of the RM using simple, easy-to-understand semantics.

In the following examples, we will revisit a set of relational entities from Chapter 1, Unlocking the Power of Modeling. In the RM, each of the three entities corresponds to a table identified by a primary key and related to other entities through foreign keys. Just observing the table names or even a data preview does not make it easy to determine these relationships, as can be seen in the following RM:

SUPERHERO
---------
SUPERHERO_NAME|BIRTHPLACE   |SUPERHERO_TYPE|HAS_MASK|
--------------+-------------+--------------+--------+
Ratman        |Gotham Gutter|Accident      |true ...

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Data Modeling with Snowflake

Published in: May 2023Publisher: PacktISBN-13: 9781837634453

Author (1)

Serge Gershkovich

Serge Gershkovich is a seasoned data architect with decades of experience designing and maintaining enterprise-scale data warehouse platforms and reporting solutions. He is a leading subject matter expert, speaker, content creator, and Snowflake Data Superhero. Serge earned a bachelor of science degree in information systems from the State University of New York (SUNY) Stony Brook. Throughout his career, Serge has worked in model-driven development from SAP BW/HANA to dashboard design to cost-effective cloud analytics with Snowflake. He currently serves as product success lead at SqlDBM, an online database modeling tool.
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RM versus entity-relationship diagram

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