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FLWOR

FLWOR is an expression in the XQuery programming language that supports iteration and binding of variables to intermediate results. FLWOR is an acronym for FOR, LET, WHERE, ORDER BY, RETURN. FLWOR is loosely analogous to SQL's SELECT-FROM-WHERE and can be used to provide join-like functionality to XML documents.for creates a sequence of nodes let binds a sequence to a variable where filters the nodes on a boolean expression order by sorts the nodes return gets evaluated once for every node

Example
for $d in doc("depts.xml")//deptno let $e := doc("emps.xml")//employee[deptno = $d] where count($e) >= 10 order by avg($e/salary) descending return { $d, {count($e)}, {avg($e/salary)} } First column of the XQuery request shows the for, let, where, order by and return keywords of the FLWOR paradigm. In plain English, this could be read as "Get all departments that have more than ten employees, order these departments by decreasing average salary, and return a report of department numbers, head counts and average salary in each big department". The result could look like: 17 25 12500 24 18 11327 3 32 10725 ==Example using Microsoft SQL Server==
Example using Microsoft SQL Server
DECLARE @xml XML SET @xml = ' 42 27 a b ' SELECT x.y.query('for $s in self::node() return $s//item_1/text()') as i, x.y.query('for $s in self::node() return $s//item_2/text()') as j FROM @xml.nodes('/root_element') AS x(y); ==References==
Source: Wikipedia ↗
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