How do I list all the columns in a table?

Question

For the various popular database systems, how do you list all the columns in a table?

Answer 1

(5 years laters, for the Honor of PostgreSQL, the most advanced DDBB of the Kingdom)

In PostgreSQL:

\d table_name

Or, using SQL:

select column_name, data_type, character_maximum_length
    from INFORMATION_SCHEMA.COLUMNS 
    where table_name = 'table_name';