Databases have evolved dramatically since their inception in the early 1960s. Navigational databases such as the hierarchical database (which relied on a tree-like model and allowed only a one-to-many relationship), and the network database (a more flexible model that allowed multiple relationships), #Programming #Tutorial #Databases #FlatDatabases #Introduction #relationaldatabases #databasessql

via Francesco Lelli at the following url:

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This is a small description of the picture: Databases have evolved dramatically since their inception in the early 1960s. Navigational databases such as the hierarchical database (which relied on a tree-like model and allowed only a one-to-many relationship), and the network database (a more flexible model that allowed multiple relationships), #Programming #Tutorial #Databases #FlatDatabases #Introduction #relationaldatabases #databasessql