MySQL vs PostgreSQL vs SQLite - Visual Side-by-Side Comparison

Concept Flow - MySQL vs PostgreSQL vs SQLite

Choose Database Type

↓

Pick based on needs

This flow shows choosing between MySQL, PostgreSQL, and SQLite based on their main features and use cases.

Execution Sample

MySQL

SELECT VERSION();
-- Run this in each DB to see version
-- MySQL, PostgreSQL, SQLite
-- Shows how to connect and query

This simple query shows how to check the version of each database system.

Execution Table

Step	Database	Query	Result Example	Notes
1	MySQL	SELECT VERSION();	8.0.28	Returns MySQL version string
2	PostgreSQL	SELECT VERSION();	PostgreSQL 14.1	Returns PostgreSQL version string
3	SQLite	SELECT sqlite_version();	3.36.0	Returns SQLite version string
4	Decision	Compare features	MySQL: fast, popular PostgreSQL: advanced, standards SQLite: lightweight, embedded	Choose based on project needs
5	Exit	N/A	N/A	Decision made, no more queries

💡 After checking versions and features, choose the database that fits your project best.

Variable Tracker

Variable	Start	After MySQL	After PostgreSQL	After SQLite	Final
Selected_DB	None	MySQL	PostgreSQL	SQLite	Based on needs

Key Moments - 3 Insights

Why do MySQL and PostgreSQL use different version functions?

MySQL and PostgreSQL have different system functions; MySQL uses SELECT VERSION(), PostgreSQL also uses SELECT VERSION(), but SQLite uses SELECT sqlite_version(). This is shown in execution_table rows 1-3.

When should I choose SQLite over MySQL or PostgreSQL?

SQLite is best for small, embedded apps or testing because it is lightweight and serverless, as noted in the concept_flow and execution_table row 3.

Is PostgreSQL always better than MySQL?

Not always; PostgreSQL has advanced features and standards compliance, but MySQL is often faster and more popular for web apps. The choice depends on your project needs (execution_table row 4).

Visual Quiz - 3 Questions

Look at the execution_table, what version string does SQLite return at step 3?

A 3.36.0

B 8.0.28

C PostgreSQL 14.1

D Unknown

💡 Hint

Check the 'Result Example' column in execution_table row 3.

At which step does the decision about which database to use happen?

A Step 1

B Step 3

C Step 4

D Step 5

💡 Hint

Look at the 'Step' and 'Notes' columns in execution_table to find where the comparison is made.

If you want a lightweight embedded database, which variable value in variable_tracker should you pick?

A PostgreSQL

B SQLite

C MySQL

D None

💡 Hint

Refer to variable_tracker 'Selected_DB' and concept_flow descriptions about lightweight options.

Concept Snapshot

MySQL vs PostgreSQL vs SQLite:
- MySQL: popular, fast, good for web
- PostgreSQL: advanced features, strong SQL
- SQLite: lightweight, embedded, no server
Choose based on project size, features, and deployment needs.

Full Transcript

This visual execution compares three popular databases: MySQL, PostgreSQL, and SQLite. We start by checking their versions using simple queries. MySQL returns a version like 8.0.28, PostgreSQL returns a string like 'PostgreSQL 14.1', and SQLite uses a different function returning '3.36.0'. Then, we compare their main features: MySQL is fast and popular for web apps, PostgreSQL offers advanced features and strong SQL compliance, and SQLite is lightweight and embedded, ideal for small apps. The variable tracker shows how the selected database changes as we consider each option. Key moments clarify common confusions about version functions, when to choose SQLite, and that PostgreSQL is not always better than MySQL. The quiz tests understanding of version outputs, decision steps, and database choice for lightweight needs. This helps beginners see the differences clearly and decide which database fits their project best.