MC	Which statement is CORRECT?	An array is an unordered collection which can contain duplicates.	incorrect	A set is an ordered collection with no duplicates.	incorrect	A list is an ordered collection which cannot contain duplicates.	incorrect	A bag is an unordered collection which may contain duplicates.	correct	
MC	An ORDBMS will typically support inheritance...	only at data type level	incorrect	only at a tuple level	incorrect	only at table type level	incorrect	both at data type and table type level	correct	
MC	In the industry, ORDBMSs have...	been very successful since they replaced RDBMSs as the mainstream database technology.	incorrect	have had modest success with most companies only implementing a carefully selected set of extensions.  	correct	have not been successful at all.	incorrect	
MC	The key difference between stored procedures and triggers is that:	Stored procedures are stored in the data catalog, whereas triggers are not.  	incorrect	Stored procedures cannot have input variables whereas triggers can.	incorrect	Stored procedures are more difficult to debug than triggers.  	incorrect	Stored procedures are explicitly invoked whereas triggers are implicitly invoked.	correct	
MC	Which statement is CORRECT?	A list is an ordered collection which cannot contain duplicates.	incorrect	An array is an unordered collection which can contain duplicates.	incorrect	A set is an ordered collection with no duplicates.	incorrect	A bag is an unordered collection which may contain duplicates.	correct	
MC	Which data type can be used to store image data?	DBCLOB	incorrect	CLOB	incorrect	BLOB	correct	None of these types	incorrect	
MC	Which of the following is not an advantage of triggers?	Triggers allows to perform synchronic updates in case of data replication.	incorrect	Triggers allow to avoid deadlock situations.  	correct	Triggers allow to model extra semantics and/or integrity rules without changing the user front-end or application code.	incorrect	Triggers support automatic monitoring and verification in case of specific events or situations.	incorrect	
MC	Which statement is CORRECT?	User Defined Functions (UDFs) can only work on user-defined data types.	incorrect	User Defined Functions (UDFs) must be stored in the application, and not in the catalog.  	incorrect	User Defined Functions (UDFs) can only be defined in SQL.	incorrect	A sourced function is a UDF which is based on an existing, built-in function.	correct	
MC	Recursive queries are a powerful SQL extension which allow to formulate complex queries such as...	queries that need to combine data from multiple tables.	incorrect	queries that need to navigate through a hierarchy of tuples.	correct	queries that need to get access to multimedia data.	incorrect	queries that have multiple subqueries.	incorrect	
MC	Which statement is CORRECT?	A list is an ordered collection which cannot contain duplicates.	incorrect	The BLOB data type can be used to store image data.	correct	Opaque data types in an ORDBMS are always based on existing SQL data types. 	incorrect	A trigger has the same functionality as a CHECK constraint.	incorrect