PostgreSQL 7.1.3 Documentation
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# 3.3. pg_attrdef

This catalog stores column default values. The main information about columns is stored in `pg_attribute` (see below). Only columns that explicitly specify a default value (when the table is created or the column is added) will have an entry here.

Table 3-3. pg_attrdef Columns

Name | Type | References | Description
--- | --- | --- | ---
adrelid | `oid` | pg_class.oid | The table this column belongs to
adnum | `int2` |  | The number of the column; see `pg_attribute`.`pg_attnum`
adbin | `text` |  | An internal representation of the column default value
adsrc | `text` |  | A human-readable representation of the default value

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