Free PostgreSQL practice · Intermediate

Learn PostgreSQL
by doing.

Forty-five hands-on drills built around deployments, incidents, pipelines, product usage, and the messy-but-real data you meet at work.

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Today’s focus

Strategic accountsSELECT · WHERE · ORDER BY

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Diagnostic0/6

Joins0/6

Metrics0/7

CTEs0/6

Windows0/7

Time0/5

Field Ops0/6

Stretch0/2

All drills

45 exercises

01 / Diagnostic

Refresh filtering, NULLs, CASE, and basic grouping.

02 / Joins

Connect operational entities without losing or multiplying rows.

03 / Metrics

Build reliable operational metrics with grouped SQL.

04 / CTEs

Decompose ambiguous questions into inspectable stages.

05 / Windows

Rank, deduplicate, compare, and calculate running values.

06 / Time

Reason about cohorts, latency, intervals, and time buckets.

07 / Field Ops

Answer messy deployment and customer-health questions.

08 / Stretch

Learn PostgreSQLby doing.