The pg_attrdef table stores column default values. The main information about columns is stored in pg_attribute. Only columns that explicitly specify a default value (when the table is created or the column is added) will have an entry here.
| column | type | references | description |
|---|---|---|---|
adrelid |
oid | pg_class.oid | The table this column belongs to |
adnum |
int2 | pg_attribute.attnum | The number of the column |
adbin |
text | The internal representation of the column default value | |
adsrc |
text | A human-readable representation of the default value. This field is historical, and is best not used. |
Parent topic: System Catalogs Definitions
