Michael,
> The documentation implies that you can have a non-atomic field other
> than a
> simple array, perhaps something like a C structure of different
> types. Is
> this possible, and if so, how?
First off, you need to evaluate your reasons for wanting an non-atomic
field. As you may know, non-atomic fields violate relational integrity
and lead to development, maintainence, and normalization problems.
Also, it is nearly impossible to index them effectively, resulting in
poor performance.
Frankly, I have yet to hear a case for a custom non-atomic field that
was not better solved by seperating the data in to several fields of
different datatypes.
That being said, the way you create a non-atomic field is by creating a
custom data type. This is no simple task. See:
http://www.postgresql.org/idocs/index.php?sql-createtype.html
Please note that you will have to write functions for input, display,
and transmission of this custom data type, as well as manually defining
any operators (+, ||, etc.) that you want to use with the custom data
type.
-Josh Berkus
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