This example shows the use of the default_clause in column definitions. The path for customerName is modified to one that does not match the document structure. The default value is returned for the customer name.
SELECT X.*
FROM (SELECT * FROM customer WHERE customerID = 1) AS C,
XMLTable (
'/Customer/Order/Item'
PASSING C.customerXML
COLUMNS
"Seqno" FOR ORDINALITY,
"CustomerName" VARCHAR(64) PATH '../../NonExistentNode' DEFAULT 'John Doe',
"OrderNumber" VARCHAR(32) PATH '../@Number',
"OrderDate" DATE PATH '../@Date',
"ItemID" VARCHAR(12) PATH '@ID',
"Quantity" INTEGER PATH 'Quantity',
"UnitPrice" DECIMAL(9,2),
"TotalPrice" DECIMAL(9,2) PATH 'Price'
) AS X ("Sequence #", "Customer Name", "Order #", "Order Date", "Item ID", "Qty", "Unit Price", "Total Price");
The result of the query is:
Sequence # Customer Name Order # Order Date Item ID Qty Unit Price Total Price --------------------------------------------------------------------------------------- 1 John Doe NW-01-16366 12/02/28 001 10 29.50 295.00 2 John Doe NW-01-16366 12/02/28 101 1 139.99 139.99