HELP! TO_CHAR FUNCTION IN SELECT - Oracle7 on Windows 95

I am doing my first project in Oracle. The statement -

SELECT TO_CHAR(col_with_date_datatype, 'mm/dd/yy hh24:mi:ss') "Date and

    Time",col_a,col_b FROM table_name WHERE ...;

is producing too-wide (almost 80 column) "Date and Time" column display. SQL*Plus 32 is executing the SQL commands. I have tried

    COLUMN name FORMAT A20

but has no affect on the display format. Similar examples in Oracle manuals show proper output. Any help thru posting/e-mail would be appreciated?
Thanks in advance,
Harpreet Received on Fri Apr 26 1996 - 00:00:00 CEST