Syntax:
NAME_CONST(name,value)

Returns the given value. When used to produce a result set column,
NAME_CONST() causes the column to have the given name. The arguments
should be constants.

mysql> SELECT NAME_CONST('myname', 14);
+--------+
| myname |
+--------+
|     14 |
+--------+

URL: http://dev.mysql.com/doc/refman/5.7/en/miscellaneous-functions.html

