IBM DB2 Certification Exam Practice Questions focuses on assessing the DB2 database application development skills. The first section addresses the limitations of using DB2 Call Level Interface (CLI). Option D mentions that a DECLARE CURSOR statement must be used to declare a cursor, which prevents developers from using DB2 CLI. In fact, DB2 CLI provides an interface that does not require explicit cursor declaration, making option D correct. The second section deals with cursor operations. After declaring a cursor with DECLARE csr1 DYNAMIC SCROLL CURSOR FOR SELECT * FROM employee;, to fetch data starting from the end of the result set, FETCH PRIOR (move backward) and FETCH RELATIVE (move relatively) can be used. Option A’s FETCH LAST starts at the last row of the result set, but cannot be used to return to the end again, while option D's FETCH OFFSET typically requires an offset parameter and cannot be used alone. The third section covers XML data storage and querying in DB2. The XQuery query calculates the count of the "fruit" sub-elements in the "items" XML element. There are two "fruit" elements, so the answer should be B (2), despite the question suggesting D (4), which may be an error in the question. The fourth section involves handling multiple result sets in a PHP application when calling a stored procedure. Using the IBM_DB2 extension, calling db2_next_result($stmt) retrieves subsequent result sets, while db2_fetch_object($stmt) fetches rows from the current result set. Therefore, the correct approach is to first call db2_fetch_object for the first result set, then use db2_next_result to retrieve other result sets. These questions cover critical knowledge points of DB2 CLI, cursor operations, XML data handling, and DB2-PHP interaction, all essential for IBM DB2 certification candidates to master in areas such as data manipulation, XML support, and cross-language integration.