Mermaid ER Diagrams: Syntax, Examples and Limitations
How to write Mermaid erDiagram blocks: entities, attributes with PK and FK markers, cardinality symbols, where they render, and what Mermaid cannot do.
6 articles
Diagrams and documentation
Entity-relationship diagrams, how to read and draw them, and how to keep schema documentation honest.
Articles in this category
12 Tools to Visualize a Database Schema, Compared
From dbdiagram.io and DBeaver to SchemaSpy, tbls and Mermaid: what each schema visualization tool takes as input, what it produces and when to use it.
How to Generate an ER Diagram from Migration Files
Three ways to turn Flyway, Liquibase, Prisma or Django migrations into an ER diagram, and a step-by-step guide to the one that always matches reality.
How to Read a Database Schema Diagram: Keys and Relationships
Learn to read any schema diagram: primary and composite keys, foreign keys and arrow direction, one-to-many, join tables, one-to-one and self-references.
Why Parsing SQL Is Not Enough to Draw Your Database Schema
SQL parsers stumble on dialects, procedural blocks, generated DDL and renames across files. Running migrations on a real engine and reading the catalog is reliable.
What Is an ER Diagram? Entities, Relationships, Cardinality
A plain explanation of entity-relationship diagrams: entities, attributes, relationships, cardinality, the common notations, and what belongs in one.
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