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What Is a Primary Key in SQL? Learn with Examples

A primary key is a column in a database table that uniquely identifies each row. Each table can have only ONE primary key, and it can’t be left empty.

Tutorials • 06-Aug-2025

Free SQL Tool to Understand Your Database Visually

Learn SQL faster with a free SQL client that shows your database visually in an ER diagram. See tables, relationships, query results, and edit data easily.

Dbschema features • 05-Aug-2025

How to Generate Database Documentation (HTML5, PDF, Markdown)

Generate interactive database documentation in HTML5, PDF, or Markdown using DbSchema. Add diagrams, comments, and sync everything with Git.

Dbschema features • 01-Aug-2025

What Is a Foreign Key Constraint in SQL?

A foreign key links one table to another by matching values, usually to a primary key. It keeps data accurate and prevents invalid references.

Tutorials • 31-Jul-2025

Visual Database Management & Design Tool for IBM Db2

Discover an ER diagram tool for IBM Db2 that simplifies schema modeling, database management, querying, Git integration, and documentation. Try it free for 30 days.

Databases • 25-Jul-2025

How to Design and Manage Apache Derby Databases Visually

Visual guide for Apache Derby: create diagrams, edit schema, sync changes, generate docs, and explore data. No SQL required. Try DbSchema free.

Databases • 24-Jul-2025

How to Create ER Diagrams for SQLite with a Free Tool

Create or explore ER diagrams for your SQLite database using a free modeling tool. Visual design, schema sync, Git support, and interactive documentation.

Sqlite • 23-Jul-2025

MongoDB Aggregation Pipeline Tutorial for Beginners in 2025

Understand MongoDB aggregation pipelines with clear examples. Learn how to filter, group, sort, and transform data step by step in this beginner-friendly guide.

Mongodb • 21-Jul-2025

SQL Server 2025 - What’s New and How to Visualize the Schema

Explore SQL Server 2025 features: AI queries, JSON indexing, performance, and security upgrades. Visualize and manage schemas with a design tool.

Sql server • 16-Jul-2025

Database Design Errors to Avoid & How To Fix Them

Avoid common database design mistakes in 2025, like missing foreign keys, poor indexing, and bad JSON use. Learn simple fixes with practical examples.

Design • 15-Jul-2025