SQLite Editor & DB Viewer vs DB RelationalAlgebra

SQLite Editor & DB Viewer opens, browses, and edits SQLite and .db database files right on your iPhone and iPad — no computer, no setup, no account. Whether you're a developer inspecting an app's database, a student learning SQL, or an analyst exploring data on the go, everything runs locally and offline. OPEN & BROWSE ANY DATABASE • Open .db, .sqlite, and .sqlite3 files from Files, iCloud, or share sheet • Browse every table, view rows and columns, and inspect the full schema • Fast search across tables and values • Works completely offline — your data never leaves your device RUN SQL — OR SKIP IT • Full SQL editor with syntax highlighting to run any query • Visual Query Builder: tap tables, columns, and filters and the app writes the SQL for you — no syntax to memorize • Edit rows inline, add and delete records, and commit changes safely IMPORT & EXPORT • Import spreadsheets — CSV, JSON, and Excel — straight into a table • Export tables and query results to CSV • Save databases back to your device LEARN SQL AS YOU GO • 26 interactive SQL lessons — from SELECT and WHERE to JOINs and subqueries • A practice sandbox with a ready-made sample database — try queries with zero risk • Perfect for beginners moving from "no SQL" to confident queries BUILT FOR iPHONE & iPAD • Designed for both — a full workspace on the big iPad screen • Clean dark interface, easy on the eyes PRO (optional) • Remove ads and unlock the full set of power features • Available as a monthly subscription or a one-time lifetime unlock • A free trial of each Pro feature is included — no commitment Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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.