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151 results:

91. XQuery | FLWOR structure | Bracketing in the Return clause

Bracketing in the Return clause Apart from the embedding of XQuery expressions in the return clause, a characteristic feature of the priority regulation with regard to the…

92. XQuery | Joins | Tracing of references

Tracing of references In principle, elements from various XML documents or within a XML document may be put into relation in two ways. The join (known from…

93. XQuery | Joins

Joins In contrast to the relational modelling for the representation of discourse areas, there is a broad range of liberties with regard to the structuring of the representation in…

94. XQuery | Joins | Symmetric join

Symmetric join In XQuery, a join is specified as a "nested for loop", whereby in the for clause(s) the control variables are bound, in the where clause the join predicate is…

95. XQuery | Joins | Left or right outer join

Left or right outer join The symmetry of the nested for clauses is only to be maintained if it can be ensured that there is at least one join partner for each…

96. XQuery | Joins | Join variants

Join variants While the semantics of a left or right outer join can be structurally integrated into the hierarchical concept of the XML data model without any problems, the definition of a…

97. XQuery | Joins | Asymmetric join notation

Asymmetric notation of a left or right outer join For the last case of the full outer join, the required XQuery query pattern is demonstrated on the example of the previous section in two…

98. XQuery | Joins | Full outer join

Formulation of a full outer join Now, the alternative asymmetric formulation of a left or right outer join shown on the previous page can be used in order to formulate a full outer join in XQuery.…

99. XQuery | Grouping & aggregation

Grouping and aggregation Apart from the joins, the groupping with subsequent aggregation represents the central type of transformations on data stocks which have to be described with the help of…

100. XQuery | Grouping & aggregation | Grouping according to structure

Grouping according to structure The first step of the grouping means that only one representative from a set of items with equal manifestations with regard to the grouping attribte is taken…

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