IOPS is a measurement that takes into account only sequential reads and writes

Identify the property that describes a collection of all of the element nodes contained within node.

A. node.children B. node.children.length C. node.childElementCount D. node.ownerdocument

The ER diagram in Figure 17.13 shows only entities and primary key attributes. The absence of recognisable named entities or relationships is to emphasize the rule-based nature of the mapping rules described in Step 2.1 of logical database design.

Answer the following questions with reference to how the ER model in Figure 17.13 maps to relational tables.
(a) How many relations will represent the ER model?
(b) How many foreign primary keys are mapped to the relation representing X?
(c) Which relation(s) will have no foreign key?
(d) Using only the letter identifier for each entity, provide appropriate names for the
relations mapped from the ER model.
(e) If the cardinality for each relationship is changed to one-to-one with total participation
for all entities; how many relations would be derived from this version of the ER model?