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XQuery Sequence Functions

Let's see the list of commonly used sequence functions provided by XQuery:

Index Name Description
1) count($seq as item()*) It is used to count the items in a sequence.
2) sum($seq as item()*) It is used to return the sum of the items in a sequence.
3) avg($seq as item()*) It is used to return the average of the items in a sequence.
4) min($seq as item()*) It is used to return the minimum valued item in a sequence.
5) max($seq as item()*) It is used to return the maximum valued item in a sequence.
6) distinct-values($seq as item()*) It returns select distinct items from a sequence.
7) subsequence($seq as item()*, $startingloc as xs:double, $length as xs:double) It is used to return a subset of provided sequence.
8) insert-before($seq as item()*, $position as xs:integer, $inserts as item()*) It is used to insert an item in a sequence.
9) remove($seq as item()*, $position as xs:integer) It is used to remove an item from a sequence.
10) reverse($seq as item()*) It is used to return the reversed sequence.
11) index-of($seq as anyatomictype()*, $target as anyatomictype()) It returns indexes as integers to indicate availability of an item within a sequence.
12) last() It returns the last element of a sequence when used in predicate expression.
13) position() It is used in FLOWR expressions to get the position of an item in a sequence.
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