Setyo,
> How is it to display the listings/ detailed descriptions of a
> function
> or a table created using plpgsql or using database client such as
> psql?
Check out the \d commands through PSQL:
\dt gives you a listing of all tables
\df gives you a listing of all functions
\d table-name gives you a schema of the table
\d function-name gives you a list of parameters
etc.
Typing "\?" on the PSQL command line will show you more options.
-Josh
