Data that have a multilevel structure occur frequently across a range of disciplines, including epidemiology, health services research, public health, education and sociology. We describe three ...

Management Science, Vol. 36, No. 8 (Aug., 1990), pp. 887-899 (13 pages) We focus on ways of combining simple database models with managerial intuition. We present a model and method for isolating ...

Get started modeling entities and relationships for Java data persistence, using an example application based on Java 21 with Hibernate 6.3.