Re: pl/pgsql docs 37.4.3. Row Types -- how do I use this

>Unless your function parameter is an integer you must quote it... eq:
>
>select use_two_tables('tablename');
>

Hrm... That does not work either:

# select use_two_tables('tablename');
ERROR: function use_two_tables("unknown") does not exist
HINT: No function matches the given name and argument types. You may need
to add explicit type casts.
# select use_two_tables('tablename'::text);
ERROR: function use_two_tables(text) does not exist
HINT: No function matches the given name and argument types. You may need
to add explicit type casts.

I am not really sure... just learning this, but I believe the parameter
type is tablename, right?

>>CREATE TABLE tablename( ...

>>CREATE or REPLACE FUNCTION use_two_tables(tablename) RETURNS text AS '
>>...

Do I need to cast the string to something?

# \df use_two*
List of functions
Result data type | Schema | Name | Argument data types
------------------+--------+----------------+---------------------
text | lee | use_two_tables | tablename
(1 row)

# select use_two_tables('tablename'::tablename);
ERROR: cannot cast type "unknown" to tablename
# select use_two_tables(tablename::tablename);
ERROR: column "tablename" does not exist

Thanks for your help.

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