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51.14. pg_conversion
  The catalog pg_conversion describes encoding conversion procedures. See CREATE CONVERSION for more information.
Table 51.14. pg_conversion Columns
| Name | Type | References | Description | 
|---|---|---|---|
oid | 
        oid | 
        Row identifier (hidden attribute; must be explicitly selected) | |
conname | 
        name | 
        Conversion name (unique within a namespace) | |
connamespace | 
        oid | 
        pg_namespace.oid | 
        The OID of the namespace 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 | 
        bool | 
        True if this is the default conversion | 
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 https://www.postgresql.org/docs/10/catalog-pg-conversion.html