# DB RelationalAlgebra

> DB RelationalAlgebra (iPhone/iPad app by Artur Borycki.)

- Source: https://appshunter.io/ios/app/db-relationalalgebra/id6792125742 (this page in markdown: same URL + `.md`)
- Developer: [Artur Borycki](https://appshunter.io/developer/6792125744)
- Category: Developer Tools, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-08-04
- Data updated: 2026-09-05
- User reviews in markdown: https://appshunter.io/ios/app/db-relationalalgebra/id6792125742/reviews.md

## What is DB RelationalAlgebra?

A native iPad and iPhone app that converts a SQL query typed, pasted, or imported from a .sql file  into relational algebra, tuple relational calculus and domain relational calculus. Each notation gets a step by step derivation, a final oneline formula, and an interactive diagram  an operator tree for the algebra, a quantifier scope tree for the calculus  and a fourth view stacks all three against the same query. Whatever SQL asks for that a notation cannot express exactly is reported rather than quietly approximated.


## Version history (last 3 releases)

### 1.1 — 2026-09-03

Parsing of SQL queries to tuple relational calculus and domain relational calculus

### 1.0.1 — 2026-08-12

Updated iPhone experience

### 1.0 — 2026-08-04

No release notes.

## Related topics

[relational algebra](https://appshunter.io/ios/topics/relational-algebra) · [db relationalalgebra](https://appshunter.io/ios/topics/db-relationalalgebra) · [next db navigator](https://appshunter.io/ios/topics/next-db-navigator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-05.*