DAYNAME
Extracts the name of the day of the week from a date.
Syntax
DAYNAME (dateobj)
Arguments
dateobj: a valid date, datetime, or parsable date string.
Return Type
String. If dateobj is not a valid date, returns NULL.
Examples
SELECT DAYNAME('2014-04-18');
****
+-----------------------+
| DAYNAME('2014-04-18') |
+-----------------------+
| Friday |
+-----------------------+