May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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How it works…
Uniqueness is always enforced by an index.
Each index is defined with a data type operator. When a new row is inserted or the set of column values is updated, we use the operator to search for existing values that conflict with the new data.
So, to enforce uniqueness, we need an index and a search operator defined on the data types of the columns. When we define normal UNIQUE constraints, we simply assume that we mean the equality operator (=) for the data type. The EXCLUDE syntax offers a richer syntax to allow us to express the same problem with different data types and operators.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.