On 2/3/15, 10:24 AM, "Justin Swanhart" <greenl...@gmail.com> wrote:
>NULL and missing are two different concepts. Null means unknown, not >missing. The data structure should have an ability to store NULL to be >compatible with RDBMS semantics. While a dynamic column is similar to a >NoSQL document store it is not one, and should support SQL semantics. > >IMHO > >--Justin Hi Justin, My understanding has always been basically what Wikipedia says: >> Null is a special marker used in Structured Query Language (SQL) to >>indicate that a data value does not exist in the database. Introduced by >>the creator of the relational database model, E. F. Codd, SQL Null >>serves to fulfill the requirement that all true relational database >>management systems (RDBMS) support a representation of "missing >>information and inapplicable information". What does Null represent if not the above? Tom _______________________________________________ Mailing list: https://launchpad.net/~maria-discuss Post to : maria-discuss@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-discuss More help : https://help.launchpad.net/ListHelp
