vertabelo.com
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Vertabelo is an online data modeling and database design platform that lets you create and visualize ER diagrams, design schemas, and generate SQL code. It also offers tutorials, articles, and resources on database design best practices for learners and professionals.
More resources on Database Design
use-the-index-luke.com
A practical guide to database indexing and query optimization, offering clear explanations of how indexes work, how to design them, and tutorials with SQL examples across major relational databases.
dbdiagram.io
A browser-based diagramming tool where you write schemas in a simple DSL and it renders the entity-relationship diagram automatically. Useful for sketching tables, keys and relationships, then exporting SQL DDL or sharing the diagram.
Database Star
Ben Brumm's tutorial site covering SQL syntax across Oracle, PostgreSQL, MySQL and SQL Server, plus normalization and schema modelling guides. Articles include runnable scripts and sample datasets, so readers can practise each design or query technique directly.
Database Design for Mere Mortals
A vendor-neutral, step-by-step method for relational design: identifying entities, defining fields and keys, establishing table relationships and applying business rules. Readers finish able to produce a normalized logical schema before writing any SQL.
Database Design
University of Colorado Boulder course, part of its data science master's, covering the relational model, entity-relationship modelling and normal forms. Learners translate requirements into an ER diagram and then into normalized SQL table definitions.
SQLShack
Free article library started by ApexSQL, written by SQL Server professionals, covering T-SQL, indexing, query tuning, backup and recovery, high availability, auditing and SSIS. Readers can follow step-by-step examples to administer, secure and tune SQL Server instances.