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E. F. Codd mentioned nulls as a method of representing missing data in the relational model in a 1975 paper in the FDT Bulletin of ACM-SIGMOD.Codd's paper that is most commonly cited with the semantics of Null (as adopted in SQL) is his 1979 paper in the ACM Transactions on Database Systems, in which he also introduced his Relational Model/Tasmania, although much of the other proposals from ...
An 1857 ticket to "Washing the Lions" at the Tower of London.No such event ever took place. April Fools' Day or All Fools' Day [1] is an annual custom on 1 April consisting of practical jokes and hoaxes.