FLWORとは 意味・読み方・使い方

The programming language XQuery defines FLWOR (pronounced 'flower') as an expression that supports iteration and binding of variables to intermediate results. FLWOR is an acronym: 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