July 2005
Intermediate to advanced
1032 pages
27h 10m
English
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Indexing Custom Data Types
At this point, you have a reasonably complete custom data type. You can create and display FCUR values, store them in a table, compare two FCUR values, and convert them to (and from) other data types. But you're missing one important feature: You can't create an index that includes an FCUR value. Once you have all of the comparison operators (<, <=, =, >=, and so on) in place you are two short steps away.
To index values of a given data type, you must create an operator class that tells PostgreSQL which operators it should use for that type. You may recall from Chapter 3, “PostgreSQL Syntax and Use,” that PostgreSQL supports a number of index types (B-tree, hash, R-tree, and GiST). Each index type requires a different ...
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