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Qt basic programming
Qt basic programming

... • Items are added to the scene by calling QGraphicsScene::addItem(), and then retrieved by calling one of the many item discovery functions i.e. QGraphicsScene::itemAt() • QGraphicsScene's event propagation architecture schedules scene events for delivery to items, and also manages propagation betwe ...
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... Social network analysis focuses on the relations among and between entities in a social or organizational system. For most of its history, social network analysis has operated on a notion of a dataset - a clearly delimited and pruned set of observations that have been encoded and parameterized using ...
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Entity–attribute–value model

Entity–attribute–value model (EAV) is a data model to describe entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest. In mathematics, this model is known as a sparse matrix. EAV is also known as object–attribute–value model, vertical database model and open schema.
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