Select query formatting

http://docs.oracle.com/cd/A87860_01/doc/server.817/a82950/ch4.htm#1001125

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COLUMN ENAME FORMAT A4

SQL> COLUMN COMM LIKE SAL HEADING Bonus

To list the current display attributes for a given column, use the COLUMN command followed by the column name only, as shown below:
COLUMN column_name
To list the current display attributes for all columns, enter the COLUMN command with no column names or clauses after it:
COLUMN
To reset the display attributes for a column to their default values, use the CLEAR clause of the COLUMN command as shown below:
COLUMN column_name CLEAR
To reset the attributes for all columns, use the COLUMNS clause of the CLEAR command.