@aleks-sqlbrief

Aleks

@aleks-sqlbriefJoined October 2026

Building SQLBrief: hands-on SQL practice, from your first query to product analytics.

About

I'm Aleks, building SQLBrief. I write about SQL mistakes that change the meaning of a report, with examples you can run yourself. SQLBrief offers browser-based SQL practice in English and Russian.

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Aleks's blogs

SQLBriefsqlbrief.hashnode.dev1 post

Why a LEFT JOIN reports 100% activation when three users never activated

Suppose you're analysing a project-management app. People sign up to organise their work, but some leave without creating a project. You want to know how many new users take that first step within sev

4d ago · 12 min readsqlbrief.hashnode.dev

Aleks

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Aleks's blogs

Why a LEFT JOIN reports 100% activation when three users never activated

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Aleks

About

Available for

Aleks's blogs

Why a LEFT JOIN reports 100% activation when three users never activated