Sql Er Diagrams — Free Sql Tutorial

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TL;DR: Learn Sql Er Diagrams in Sql with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 14, 2026

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Sql Er Diagrams in Sql

ER diagrams visually represent database structure using entities, attributes, and relationships.

Entities are tables; attributes are columns; relationships show how tables connect.

Cardinality notation: 1:1 (one-to-one), 1:N (one-to-many), M:N (many-to-many).

Primary keys (PK) uniquely identify rows; foreign keys (FK) reference other tables.

Crow's foot notation uses symbols to show cardinality: | (one), O (zero), > (many).

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