Which type of constructor creates a collection of key-value pairs, where the value of a key can be used to retrieve the corresponding value? A O List B C D O Bag Dictionary O Array Which of the following commands specifies a new relation by giving it a name and specifying its attributes and initial constraints? B C D RENAME UPDATE O ALTER O CREATE TABLE Which of the following joins is the default type of join in a joined table, where a tuple is included in the result only if a matching tuple exists in the other relation? A O Outer B O Cross n O Natural D O Inner Which normal form is based on the concepts of multivalued dependencies? A O 2NF B O 3NF C O 4NF D O 1NF Which of the following SQL functions specifies a tag name that will appear in the XML result? A B C D XMLROOT O XMLAGG XMLELEMENT O XMLATTRIBUTES