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Historical version. PostgreSQL 6.3 reached end of support in March 2003. See the current manual for supported releases.
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Chapter 32. Extending SQL: Types

As previously mentioned, there are two kinds of types in Postgres: base types (defined in a programming language) and composite types (instances). Examples in this section up to interfacing indices can be found in complex.sql and complex.c. Composite examples are in funcs.sql.

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Programming Language Functions Up User-Defined Types

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