BootSelf
sql

lag

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

Where it sits

Learn first

Nothing: a good place to start.

This skill

lag

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

LAG: Reading the Previous Row in SQL

5 parts

Open the lesson

Find out where you stand

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

lag: common questions

What is lag?

lag is a skill in sql, needed by 10 roles on BootSelf.

Which jobs need lag?

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 lag?

Nothing in particular: it's a good place to start.

How do I practise lag?

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.