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A database concept used to represent missing, unknown or inapplicable data.

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I was reading this article on BBC. It tells a story of a person named Jenifer Null and how she faces day to day problems while using online databases like booking plane tickets, net banking etc. I … accept the name "Null". I have not tried it though. Could someone explain the technicalities when this situation would occur? Is the form validation just doing a string == NULL or something? Even so I do not think NULL is same as "NULL". …
asked Apr 18 '16 by Souradeep Nanda