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sql · postgresql-dba

Consistency constraints

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

Where it sits

Learn first

Alter tablePRIMARY KEY constraintThe NULL value

This skill

Consistency constraints

Leads to

CHECK constraint

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

Consistency constraints

Data Definition Language

about 7 min2 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

Consistency constraints: common questions

What is Consistency constraints?

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

Which jobs need Consistency constraints?

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 Consistency constraints?

Alter table, PRIMARY KEY constraint, The NULL value.

How long does it take to learn Consistency constraints?

The starting lesson, Consistency constraints, takes about 7 minutes. Reaching the level a job asks for takes practice on top: BootSelf measures where you are and plans the rest.

How do I practise Consistency constraints?

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.