Download Ranking of Database Query Results

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Space Requirements
To build the conditional and the global lists, space
consumed is O(mn) bytes (where ‘m’ is the number
of attributes and ‘n’ is the number of tuples of the
database table)
There may be applications where space is an
expensive resource.
In such cases, only a subset of the lists may be stored
at pre-processing times, but this will at the expense
of an increase in query processing time.
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