My daily readings 03/17/2012

    • In other words, the transitive closure of a graph is a graph which contains an edge (u,v) whenever there is a directed path from u to v.

       

      graph_transitive_closure

       

      As already mentioned, SQL has historically been unable [3] to express recursive functions needed to maintain the transitive closure of a graph without an auxiliary table. There are many solutions to solve this problem with a temporary table (some even elegant [2]), but I still haven’t found one to do it dynamically.

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