22.1. A User-Defined Data Type
Let's get started and see how you can add a user-defined data type to PostgreSQL. The standard distribution of PostgreSQL offers a set of predefined data types. In some cases these data types might not offer enough efficiency for your applications. If you have to store special information that cannot easily be modeled using standard data types, it can be useful to implement your own data type. Because this can easily be done, we have decided to provide a brief example.
The goal of this section is to implement a data type for storing information about spheres. Several files will be needed, as shown in Table 22.1.
| Filename | Description |
|---|---|
| Makefile | This file is used to run the ... |
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