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sql · postgresql-dba · bi-analyst · data-analyst · data-engineer

SQL and Databases

10 roles need it, 9 as coreUsually level 3: WorkingLesson available

Where it sits

Learn first

Basics SQLFor data analysisData visualization with Python

This skill

SQL and Databases

Leads to

The roles below put it to work directly.

Jobs that need it

What level 3 (Working) means

Uses it independently on the job. Level 4 (Strong): handles hard cases, reviews others.

Start learning

Learn

Adding and Removing Data

17 parts

Open the lesson

Find out where you stand

A free check, then a route that starts at your level.

Check my readiness

Learned alongside it

ABSAggregate functionsAlter tableBasic data typesBasic DELETE statementBasic SELECT statementBasic UPDATE statementBasics SQL

SQL and Databases: common questions

What is SQL and Databases?

SQL and Databases is a skill in sql and postgresql-dba and bi-analyst and data-analyst and data-engineer, needed by 10 roles on BootSelf.

Which jobs need SQL and Databases?

Backend Developer (ASP.NET Core), Backend Developer (Go), Backend Developer (Java, Spring Boot), Backend Developer (Node.js), Backend Developer (Python), and 5 more. Most ask for level 3 (Working): uses it independently on the job.

What should I learn before SQL and Databases?

Basics SQL, For data analysis, Data visualization with Python.

How do I practise SQL and Databases?

Check your readiness for free, then BootSelf builds a route and short daily learning loops: a little theory, checks on what you get wrong, then a small program.