FLWOR 是 "For, Let, Where, Order by, Return" 的只取首字母缩写。 for 语句把 bookstore 元素下的所有 book 元素提取到名为 $x 的变量中。 where 语句选取了 price 元素值大于 30 的 book 元素。 order by 语句定义了排序次序。 将根据 title 元素进行排序。 return 语句规定返回什么内容。 在此返回的是 title 元素。

FLWOR is an acronym: FOR, LET, WHERE, ORDER BY, RETURN. [1] . FLWOR is loosely analogous to SQL 's SELECT-FROM-WHERE and can be used to provide join-like functionality to XML documents. First column of the XQuery request shows the for, let, where, order by and return keywords of the FLWOR paradigm.

XQuery defines the FLWOR iteration syntax. FLWOR is the acronym for for, let, where, order by, and return. A FLWOR statement is made up of the following parts: One or more FOR clauses that bind one or more iterator variables to input sequences. Input sequences can be other XQuery expressions such as XPath expressions.

FLWOR (pronounced "flower") is an acronym for "For, Let, Where, Order by, Return". We will use the "books.xml" document in the examples below (same XML file as in the previous chapter). View the "books.xml" file in your browser. Look at the following path expression:

FLWOR is an acronym that stands for " F or, L et, W here, O rder by, R eturn". The following list shows what they account for in a FLWOR expression: Consider the following example that contains information about a bookstore. We will use a FLOWR expression to retrieve the authors of these books with a price lower than 20.

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).

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FLWOR is an acronym that stands for "For, Let, Where, Order by, Return". The following list shows what they account for in a FLWOR expression −. F - For - Selects a collection of all nodes. L - Let - Puts the result in an XQuery variable. W - Where - Selects the …

These examples show to how to use FLWOR expressions in complete queries to perform joins, grouping, and aggregation. The following query joins XML data from the PRODUCT and …

Although it might be true that in SQL every query is a SELECT statement, don't imagine that in XQuery every query has to be a FLWOR expression. The name FLWOR comes from the five clauses that make up a FLWOR expression: for, let, where, order by, and return.