# pg_amproc

The `pg_amproc` table stores information about support procedures associated with index access method operator classes. There is one row for each support procedure belonging to an operator class.



Table 1. `pg_catalog.pg_amproc`

| column          | type    | references     | description                                |
| :-------------- | :------ | :------------- | :----------------------------------------- |
|`oid`	|oid|		|Row identifier (hidden attribute; must be explicitly selected)
|`amprocfamily`|	oid|	pg_opfamily.oid	|The operator family this entry is for
|`amproclefttype`|	oid|	pg_type.oid	|Left-hand input data type of associated operator
|`amprocrighttype`|	oid|	pg_type.oid|	Right-hand input data type of associated operator
|`amprocnum`|	smallint	||	Support procedure number
|`amproc`|	regproc	|pg_proc.oid|	OID of the procedure