August 2010
Intermediate to advanced
512 pages
13h 53m
English
Content preview from Managing Time in Relational DatabasesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.
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