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151 results:

101. XQuery | Grouping & aggregation | Grouping according to equality of values

Grouping according to equality of values The second method of a grouping in XQuery is closer to the relational method to the extent that the group definition is…

102. XQuery | Grouping and aggregation | Aggregation functions

Aggregation functions In XQuery the aggregation is based on the formulation in OQL, whereby the "classic" aggregation functions fn:sum(), fn:avg(), fn:count(), fn:min()…

103. XQuery | Grouping & aggregation | Grouping via several attributes

Grouping via several attributes If facts are to be designated according to different criteria, a grouping via several attributes is required. Analogous to the relational or…

104. XQuery | Grouping & aggregation | Group filtering & sorting

Group filtering and sorting The check for existence of an item via which aggregation shall be made in order to eliminate empty grouping combinations essentially corresponds to the construct of…

105. XQuery | Grouping & aggregation | Multiple grouping

Multiple grouping The principle of the multiple grouping is applied if within a single query the original data stock shall be grouped multiple times according to different criteria. Multiple…

106. XQuery | Grouping & aggregation | Nested grouping

Nested grouping XQuery is provided with an extremely mighty feature based on the principle of the application of aggregation functions on sequences, namely the ability of the nesting with…

107. XQuery | The XQuery data model

The XQuery data model The XQuery data model has been introduced in order to be able to specify precisely the semantics of XQuery. The data model is described in the following. An own data model is…

108. XQuery | Data model | Sequences

Sequences Sequences are the central data structure in XQuery. In this section, the structure of sequences is first introduced. Then functions and operators are explained. The structure of…

109. XQuery | Data model | Functions & operations on sequences

Functions and operations on sequences Since each expression in XQuery results in a sequence, consequently also all functions in XQuery are functions on sequences. In this section, only functions are…

110. XQuery | Data model | Changes in sequences

Changes in sequences We have already introduced the concatenation of sequences with the comma operator. With this operator, also single items can be added to a sequence: let $seq := (1, 2, 3) …

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