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sql · postgresql-dba

GROUP BY statement

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

Where it sits

Learn first

Results orderingAggregate functions

This skill

GROUP BY statement

Leads to

Cohort analysis: churn and retention by cohortsRetrieving DataWindow functionsViews

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

Understanding groups

Grouping Query Results

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

GROUP BY statement: common questions

What is GROUP BY statement?

GROUP BY statement is a skill in sql and postgresql-dba, needed by 10 roles on BootSelf.

Which jobs need GROUP BY statement?

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 GROUP BY statement?

Results ordering, Aggregate functions.

How do I practise GROUP BY statement?

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.