Method for converting chained join tables to tree structure, and a program for converting the same
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United States of America Patent
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Dec 16, 2008
Grant Date -
Mar 16, 2006
app pub date -
Oct 23, 2003
filing date -
Oct 24, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
Concatenated join tables are converted into a tree structure at a high speed. First, table-formatted data is divided into one or more information blocks consisting of a value list containing item values in the sequence of the item value numbers corresponding to item values belonging to particular items and a pointer sequence containing pointer values for indicating the item value numbers in the sequence of the unique record number. Next, table-formatted data whose items are to be made common are selected, value lists of a predetermined item are made equivalent, and join is executed. Join is repeated between necessary table-formatted data. Next, among the concatenated table data, one which is to be a root is selected. According to the table-formatted data concatenation, depth of the table-formatted data is decided. According to the table-formatted data concatenation and depth, a value indicating a record is arranged on a tree description table describing the tree.
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