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🗄️ Databases & SQL

Run real SQL in your browser — SQLite via Python, no setup.

1
Lesson 1 — Create a table
basics · 7 min
→2
Lesson 2 — Insert rows
easy · 8 min
→3
Lesson 3 — Filtering with WHERE
medium · 9 min
→4
Lesson 4 — Sorting
medium · 8 min
→5
Lesson 5 — COUNT & SUM
medium · 10 min
→6
Lesson 6 — JOIN
hard · 12 min
→7
Lesson 7 — GROUP BY
hard · 12 min
→8
Lesson 8 — HAVING
hard · 11 min
→9
Lesson 9 — Subqueries
hard · 12 min
→10
Lesson 10 — JOINs
hard · 12 min
→11
Lesson 11 — ORDER BY & LIMIT
medium · 9 min
→12
Lesson 12 — DISTINCT
medium · 8 min
→13
Lesson 13 — LIKE search
medium · 9 min
→14
Lesson 14 — Aggregates
medium · 9 min
→15
Lesson 15 — Conditional UPDATE
hard · 10 min
→16
Lesson 16 — Indexes (concept)
medium · 9 min
→