Spaced Repetition
Flashcards
Turn what you read into lasting memory. Each topic becomes a deck, and reviews are scheduled so you see cards right before you would forget them. Works offline once opened.
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SQL Essentials
One quick-review card per concept across the whole Simply Advanced SQL book: keys, joins, data types and NULLs, aggregation, normalisation, data integrity, database objects, query processing, indexes, query optimisation, transactions, isolation levels, and locking. For deep dives, see the per-chapter decks.
SQL: Database Keys
Deep-dive flashcards for Chapter 1 of the Simply Advanced SQL book: primary, unique, composite, foreign, super, candidate, alternate, natural and surrogate keys.