51.6. pg_attrdef
The catalog pg_attrdef stores column default values. The main information about columns is stored in pg_attribute. Only columns for which a default value has been explicitly set will have an entry here.
Table 51.6. pg_attrdef Columns
| Name | Type | References | Description |
|---|---|---|---|
oid | oid | Row identifier | |
adrelid | oid | pg_class.oid | The table this column belongs to |
adnum | int2 | pg_attribute.attnum | The number of the column |
adbin | pg_node_tree | The column default value, in nodeToString() representation. Use pg_get_expr(adbin, adrelid) to convert it to an SQL expression. |
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https://www.postgresql.org/docs/12/catalog-pg-attrdef.html