14. Allen Relationship and Other Queries
In this chapter, we examine each of the thirteen Allen relationships, as well as each non-leaf node in the taxonomy of Allen relationships which we introduced in Chapter 3. We describe the Allen relationships as they hold between two time periods, between a time period and a point in time, and also between two points in time. We show how these relationships are expressed in terms of time periods represented with the closed-open convention, and we provide a sample query for each one.
After ...
Get Managing Time in Relational Databases now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.