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sql · postgresql-dba

Retrieving Data

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

Where it sits

Learn first

Basic SELECT statementSELECT FROM statementTypes of JOINsCASE statementIN, LIKE and BETWEEN operatorsResults ordering

This skill

Retrieving Data

Leads to

Basics SQL

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

Checking Equality

Filtering Data

13 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

Retrieving Data: common questions

What is Retrieving Data?

Retrieving Data is a skill in sql and postgresql-dba, needed by 10 roles on BootSelf.

Which jobs need Retrieving Data?

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 Retrieving Data?

Basic SELECT statement, SELECT FROM statement, Types of JOINs, CASE statement, IN, LIKE and BETWEEN operators, Results ordering.

How do I practise Retrieving Data?

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.