WEEKDAY
Extracts the day of the week from a date. Monday is 0, Tuesday is 1, etc.
Syntax
WEEKDAY (dateobj)
Arguments
dateobj: a valid date, datetime, or parsable date string.
Return Type
Integer. If dateobj is not a valid date, returns NULL.
Examples
SELECT WEEKDAY('2014-04-18');
****
+-----------------------+
| WEEKDAY('2014-04-18') |
+-----------------------+
| 4 |
+-----------------------+
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