MySQL vs PostgreSQL vs SQL Server overview - Visual Side-by-Side Comparison

Concept Flow - MySQL vs PostgreSQL vs SQL Server overview

Start: Choose a Database

↓

Compare Features

↓

MySQL

↓

Check Performance

↓

Check Licensing

↓

Make Decision

↓

Use DB

This flow shows how to compare MySQL, PostgreSQL, and SQL Server by features, performance, and licensing to decide which database to use.

Execution Sample

SQL

SELECT 'MySQL' AS DB, 'Open Source' AS License, 'Popular for web' AS Notes
UNION ALL
SELECT 'PostgreSQL', 'Open Source', 'Advanced features'
UNION ALL
SELECT 'SQL Server', 'Commercial', 'Strong Windows support';

This query lists the three databases with their license type and a short note.

Execution Table

Row	DB	License	Notes
1	MySQL	Open Source	Popular for web
2	PostgreSQL	Open Source	Advanced features
3	SQL Server	Commercial	Strong Windows support

💡 All three database rows are returned showing their license and notes.

Variable Tracker

Variable	Start	After Query	Final
DB	None	MySQL, PostgreSQL, SQL Server	MySQL, PostgreSQL, SQL Server
License	None	Open Source, Open Source, Commercial	Open Source, Open Source, Commercial
Notes	None	Popular for web, Advanced features, Strong Windows support	Popular for web, Advanced features, Strong Windows support

Key Moments - 2 Insights

Why does MySQL and PostgreSQL both say 'Open Source' but SQL Server says 'Commercial'?

MySQL and PostgreSQL are free to use and modify, while SQL Server requires a paid license. This is shown in the execution_table rows 1, 2, and 3.

What does 'Advanced features' mean for PostgreSQL compared to the others?

PostgreSQL supports more complex data types and standards, making it suitable for advanced applications. This is summarized in the Notes column in row 2.

Visual Quiz - 3 Questions

Look at the execution_table, which database is noted for strong Windows support?

A MySQL

B PostgreSQL

C SQL Server

D None

💡 Hint

Check the Notes column in row 3 of the execution_table.

At which row does the License show 'Commercial'?

A Row 1

B Row 3

C Row 2

D None

💡 Hint

Look at the License column in the execution_table.

If PostgreSQL was changed to a commercial license, how would the License column change?

A Row 2 changes to Commercial

B Only row 1 changes

C Row 3 changes to Open Source

D No changes

💡 Hint

Refer to the License column in the variable_tracker and execution_table.

Concept Snapshot

MySQL, PostgreSQL, and SQL Server are popular databases.
MySQL and PostgreSQL are open source; SQL Server is commercial.
MySQL is popular for web apps.
PostgreSQL offers advanced features.
SQL Server integrates well with Windows.
Choose based on your project needs.

Full Transcript

This overview compares three popular databases: MySQL, PostgreSQL, and SQL Server. We start by listing each database with its license type and a short note about its strengths. MySQL and PostgreSQL are open source, meaning they are free to use and modify. SQL Server requires a commercial license, so it usually costs money. MySQL is known for being popular in web applications. PostgreSQL offers advanced features like complex data types and standards support. SQL Server is strong in Windows environments. This comparison helps you decide which database fits your project best.