Minor Description
Even though table's column have long char data, 'Char Datum' only returns 1byte.
create table test1 (col1 char(5));
insert into test1 select 'a';
insert into test1 select 'abc';
insert into test1 select 'abcde';
select * from test1;
col1
-------------------------------
a
a
a
(3 rows, 0.151 sec, 6 B selected)