The pg_conversion system catalog table describes the available encoding conversion procedures as defined by CREATE CONVERSION.

    column type references description
    conname name Conversion name (unique within a namespace).
    connamespace oid pg_namespace.oid The OID of the namespace (schema) that contains this conversion.
    conowner oid pg_authid.oid Owner of the conversion.
    conforencoding int4 Source encoding ID.
    contoencoding int4 Destination encoding ID.
    conproc regproc pg_proc.oid Conversion procedure.
    condefault boolean True if this is the default conversion.

    Parent topic: System Catalogs Definitions