a database is a data structure that survives a power cut, shared by programs that don’t trust each other, queried in a language older than most of its users. the relational model has been declared dead roughly once a decade since 1970 and has outlived every announced successor. 𐃏 this page covers the model, the algebra underneath SQL, normalisation, the storage structures that make queries fast, and the machinery that keeps concurrent transactions honest.
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Knowledge is a paradox. The more one understand, the more one realises the vastness of his ignorance.