Speech by Bill Gates at HBS

Here is speech of Bill Gates which he delivered at graduation ceremony of Harvard. Worth reading!!
Text of the speech given by Microsoft chairman Bill Gates at Harvard University on June 7, 2007.
President Bok, former President Rudenstine, incoming President Faust, members of the Harvard Corporation and the Board of Overseers, members of the faculty, parents, and [...]

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Identifying and non-identifying relationships

While searching the identifying and non identification releationship database concept.
An identifying relationship means that the child table cannot be uniquely identified without the parent. For example, you have this situation in the intersection table used to resolve a many-to-many relationship where the intersecting table’s Primary Key is a composite of the left and right (parents) [...]

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