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e.last_name AS "fullname" ), XMLCol Att Val(e.hire_date, e.department_id AS "department")) AS "RESULT" FROM hr.employees e WHERE e.department_id = 30; interface, whereby you can specify the maximum number of rows to retrieve and the number of rows to skip.

This chapter describes Oracle XML DB features for generating (constructing) XML data from relational data in the database.

It describes the SQL/XML standard functions and Oracle Database-provided functions and packages for generating XML data from relational content.

SELECT XMLElement("Department", dept_t(department_id, department_name, CAST(MULTISET(SELECT employee_id, last_name FROM hr.employees e WHERE e.department_id = d.department_id) AS emplist_t))) AS deptxml FROM hr.departments d WHERE d.department_id = 10; SELECT XMLForest( dept_t(department_id, department_name, CAST (MULTISET (SELECT employee_id, last_name FROM hr.employees e WHERE e.department_id = d.department_id) AS emplist_t)) AS "Department") AS deptxml FROM hr.departments d WHERE department_id=10; SELECT extract Value(OBJECT_VALUE, '/Department/@deptno') AS deptno, extract Value(value(em), '/Employee/@empno') AS empno, extract Value(value(em), '/Employee/Ename') AS ename FROM dept_xml_tab, table(XMLSequence(extract(OBJECT_VALUE, '/Department/Employee List/Employee'))) em; elements with employee job ID and last name as the contents of the elements.

It also orders the employee XML elements in the department by their last name.

In this canonical mapping, user-defined data-type attributes are mapped to XML elements. It takes as arguments an element name, an optional collection of attributes for the element, and zero or more additional arguments that make up the element content.

It returns an determine whether or not a runtime check is made of the generated attributes, to see if any of them specify a schema location that corresponds to an XML schema that is registered with Oracle XML DB, and, if so, to try to generate XML schema-based XML data accordingly. This means, in particular, that if you use a string literal to specify an XML schema location attribute value, then a (compile-time) check will be made, and, if appropriate, XML schema-based data will be generated accordingly.

INSERT INTO dependents VALUES (4, 116, 'HELEN'); 1 row created.

INSERT INTO dependents VALUES (5, 116, 'FRANK'); 1 row created. SELECT XMLElement( "Department", XMLAttributes(d.department_name AS "name"), (SELECT XMLAgg(XMLElement("emp", XMLAttributes(e.last_name AS name), (SELECT XMLAgg(XMLElement("dependent", XMLAttributes(AS "name"))) FROM dependents de WHERE de.employee_id = e.employee_id))) FROM employees e WHERE e.department_id = d.department_id)) AS "dept_list" FROM departments d WHERE department_id = 30; dept_list -------------------------------------------------------------------------------- and the input data is missing any optional elements or attributes for which the XML schema defines default values, then those elements or attributes are included in the output with their default values.

Within this element is a child element for each employee of the department.

Within each employee element is a SELECT last_name, employee_id FROM employees WHERE department_id = 30; LAST_NAME EMPLOYEE_ID ------------------------- ----------- Raphaely 114 Khoo 115 Baida 116 Tobias 117 Himuro 118 Colmenares 119 6 rows selected.

is used to add XML-schema location references, and the target XML schema has not yet been registered with Oracle XML DB, then the XML data generated will not be XML schema-based.