The main concept of relational databases was published in 1970 by:

Question

BlackTom AI · Accepted Answer

E. F. Codd proposed the relational model in his influential 1970 paper "A Relational Model of Data for Large Shared Data Banks."

1) Relevant knowledge points and concepts
- Relational model: data represented as relations (tables) with tuples (rows) and attributes (columns).
- Key ideas introduced: relation as a mathematical concept, use of set theory and predicate logic, relational algebra operations (selection, projection, join, union, difference), and normalization principles to reduce redundancy.
- Historical fact: the seminal paper was published in Communications of the ACM in 1970.

2) Complete reasoning process step by step
- Identify origin of the relational database concept: search historical literature on database models.
- Recognize the canonical reference: Edgar F. Codd’s 1970 paper is universally cited as the introduction of the relational model.
- Connect Codd’s definitions and operators to what is taught as the core of relational databases (tables, keys, relational algebra).
- Conclude that the author of the main concept published in 1970 is E. F. Codd.

3) Calculations / intermediate steps
- No numerical calculations are required for this historical/conceptual question. The intermediate logical steps are the citation and mapping of Codd’s definitions to the relational model.

4) Why the correct answer is correct
- Codd’s 1970 publication is the primary and original formalization of relational databases; subsequent textbooks and practitioners build on his framework. The term "relational database" and the formal relational algebra come directly from Codd’s work.

5) Why the other options are incorrect
- Itzak Ben-Gan: a contemporary database researcher/author known for SQL/Transact-SQL work, not the 1970 originator.
- Hoffer: a modern textbook author (e.g., Michael Hoffer or Jeffrey Hoffer) who wrote about databases later.
- Mills: not associated with the 1970 relational model origin; not the author of the seminal paper.

6) Conclusion
The correct answer is E.F.Codd. This matches the provided answer: E.F.Codd.

The main concept of relational databases was published in 1970 by:单项选择题

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