The Relational Model

E. F. Codd proposes organizing data through relations rather than tying users to physical storage structure.

Why this milestone matters

This entry marks a change in the relationship between human intent and executable systems. It is presented as a navigational marker inside a wider, overlapping history—not as proof that a single date, person or institution acted alone.

Evidence

Evidence type: primary publication record.

IBM Research — Codd’s relational model ↗

Editorial note

CodeHistory keeps timeline priority claims revisable. Where the surviving record is retrospective, that limitation is stated rather than silently converted into certainty.