-------------------------+
| WEEKDAY('2008-02-03 22:23:00') |
+--------------------------------+
|                              6 |
+--------------------------------+

SELECT WEEKDAY('2007-11-06');
+-----------------------+
| WEEKDAY('2007-11-06') |
+-----------------------+
|                     1 |
+-----------------------+

CREATE TABLE t1 (d DATETIME);
INSERT INTO t1 VALUES
  ("2007-01-30 21:31:07"),
  ("1983-10-15 06:42:51"),
  ("2011-04-21 12:34:56"),
  ("2011-10-30 06:31:41"),
  ("2011-01-30 14:03:25"),
  ("2004-10-07 11:19:34");

SELECT d FROM t1 where WEEKDAY(d) = 6;
+---------------------+
| d                   |
+---------------------+
| 2011-10-30 06:31:41 |
| 2011-01-30 14:03:25 |
+---------------------+

URL: https://mariadb.com/kb/en/weekday/https://mariadb.com/kb/en/weekday/