Some database designers try to avoid such semantic issues by defining OrderID as non-nullable so that it must have a value, even when not part of the primary key. These designers then try to propose ...

Higher; Introducing databases Primary and foreign keys. Using flat file databases can lead to insertion, deletion and update anomalies. Use of relational databases where primary and foreign keys ...

Oracle announced the general availability of MySQL Cluster 7.3, which adds foreign key support, a new NoSQL JavaScript Connector for node.js, and an auto-installer to make setting up clusters easier.

For National 5 Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.