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u |
querying
multiple instances
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simultaneously
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accessing
any information in the
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instance
in any order
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u |
cascading
queries
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applying
any condition at any point
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keep
results of subqueries for later use
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combining
results of queries such as
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union,
intersection etc.
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result
of the query can be anything
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from
single value to an entire tree
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u |
optimizing
performance by introducing
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auxilliary
data structures
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