Oracle SQL*Plus: The Definitive Guide, 2nd Edition

Formatting Character Strings

SQL*Plus offers only one format element when it comes to character strings: A. A is always followed by a number specifying the column width in characters. Character strings shorter than the column width are displayed as left-justified within the column. Character strings that exceed the column width are wrapped or truncated based on the option specified in the COLUMN command. The following example shows a text column formatted wide enough to display the entire character string:

SQL> COLUMN a FORMAT A40
SQL> SELECT 'An apple a day keeps the doctor away.' A 
  2    FROM dual;
     
A
----------------------------------------
An apple a day keeps the doctor away.

You can format the column so it is 18 characters wide, which results in the text being wrapped within that space:

SQL> COLUMN a FORMAT A18
SQL> SELECT 'An apple a day keeps the doctor away.' A 
  2    FROM dual;
     
A
------------------
An apple a day kee
ps the doctor away
.

By default, SQL*Plus wraps the text right in the middle of a word if necessary. You can use the WORD_WRAPPED option of the COLUMN command to wrap text only at word boundaries:

SQL> COLUMN a FORMAT A18 WORD_WRAPPED
SQL> SELECT 'An apple a day keeps the doctor away.' A 
  2    FROM dual;
     
A
------------------
An apple a day
keeps the doctor
away.

You also have the ability to truncate text at the column boundary:

SQL> COLUMN a FORMAT A18 TRUNCATE
SQL> SELECT 'An apple a day keeps the doctor away.' A 
  2    FROM dual; A ------------------ An apple a day kee ...