PostgreSQL

51.6. `pg_attrdef`
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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

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.

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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PostgreSQL

51.6. pg_attrdef

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51.6. `pg_attrdef`