Syntax:
DAYNAME(date)

Returns the name of the weekday for date. As of MySQL 5.0.25, the
language used for the name is controlled by the value of the
lc_time_names system variable
(http://dev.mysql.com/doc/refman/5.0/en/locale-support.html).

URL: http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html

