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Searching for a job is hard but wisdom jobs interview questions page will simplify your job search. Looking for job interview questions? Need assistance to prepare well for the interviews. Then, here’s the solution to find your dream job in an easy and great way. XQuery is the programming language used for querying XML data. XQuery is used as same as XML for various SQL databases. XQuery is developed on XPath expressions. Search and apply for the XQuery interview questions for better interview preparation on wisdom jobs. These interview questions include basic to advance interview questions asked for various job roles on XQuery. Here, XQuery job uses various functions to retrieve the data from XML documents. Following XQuery job interview questions and answers page is helpful for job seekers.
XQuery is a XML query language which was designed to query XML data. It is same like SQL for database tables. XQuery is used to retrieve data from the XML file.
XQuery is a functional language for finding and extracting elements and attributes from XML documents. Its main usages are:
XQuery was first appeared in 2007. It was designed by W3C and became the W3C recommendation on January 23, 2007. XQuery 3.0 is a W3C recommendation from April 8, 2014.
A list of basic syntax rules for XQuery:
Difference between XQuery and Xpath:
XQuery is a functional programming and query language while XPath is XML path language.
XQuery is used to extract and manipulate data from either XML documents or relational databases while XPath is used to compute values like strings, numbers and Boolean types from another xml documents.
XML has many build-in functions. XQuery functions generally made perform with string values, numeric values, date and time comparisons, Boolean values etc.
XQuery also facilitates you to make your own functions.
Example 1: When you use function in an element.
Example 2: When you use function in the predicate of a path expression.
Example 3: When you use function in a let clause
let $name := (substring($booktitle,1,4))
In XQuery, comparison is performed with general comparison or value comparison.
1. General Comparison: It is performed by using the following symbols.
Ex: =, !=, <, <=, >, >=
2. Value Comparison: The value comparison is performed by using the following symbols.
Ex: ne, lt, le, eq, ge, gt.
See this example:
$bookstore//book/@q > 100
If any q attributes have values greater than 100, the expression will return true otherwise false.
FLWOR is an acronym which stands for "For, Let, Where, Order by, Return".
For - It is used to select a sequence of nodes.
Let - It is used to bind a sequence to a variable.
Where - It is used to filter the nodes.
Order by - It is used to sort the nodes.
Return - It is used to specify what to return (gets evaluated once for every node).
XQuery HTML format is a way to transform an XML document into an HTML page.
XQuery FLWOR and Path expression are used for selecting and filtering the XML elements. Both are used to select and filter the desired elements.
for $a in doc("bookmart.xml")/bookstore/book
order by $a/title
Conditional operation in XQuery is If-Then-Else operation. Let?s take an example to see how to use it:
for $a in doc("bookmart.xml")/bookstore/book
return if ($a/@category="ADVENTURE")
The elements, attributes and variables in XQuery language must be valid XML names and follow case sensitivity.
XQuery Add is used for adding elements, attributes, HTML elements and text in the results from the input documents.
If you want to put HTML element with XQuery FLWOR, you should have to add and tags into the FLWOR expression.
for $x in doc("books.xml")/bookstore/book/title
order by $x
A list of different types of XQuery functions:
In XQuery, time and date function is used to get time and date.
There are three types of time and date functions in XQuery:
The XQuery current date function is used to retrieve the current date.
The XQuery current-time function is used to retrieve the current time.
The XQuery current-date time() function is used to return the current date and time.
XQuery Related Tutorials
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XQuery Related Interview Questions
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