Getting Started with DB2 Express-C

264 Getting Started with DB2 Express-C
15.3 XML in DB2
Figure 15.3 below outlines how relational data and hierarchical data (XML documents) are
both stored in a DB2 hybrid database. The figure also shows the CREATE TABLE
statement that was used to create the table dept.
Figure 15.3 – XML in DB2
Note that the table definition uses a new data type, XML, for the deptdoc column. The
left arrow in the figure indicates the relational column deptID stored in relational format
(tables), while the XML column deptdoc is stored in parsed hierarchical format.
Figure 15.4 illustrates that in DB2 9, there are now four ways to access data:
• Use SQL to access relational data
• Use SQL with XML extensions (SQL/XML) to access XML data
• Use XQuery to access XML data
• Use XQuery to access relational data
Figure 15.4 – Four ways to access data in DB2