MySQL | DAYOFWEEK method
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MySQL's DAYOFWEEK(~) method returns the weekday index (1-7) of a given date or datetime.
Weekday Index | Weekday |
|---|---|
1 | Sunday |
2 | Monday |
3 | Tuesday |
4 | Wednesday |
5 | Thursday |
6 | Friday |
7 | Saturday |
Parameters
1. date | date/datetime
The date/datetime to retrieve the weekday index for.
Return value
The weekday index (1-7) of a given date or datetime.
Examples
Consider the following table about some students:
student_id | fname | lname | day_enrolled | age | username |
|---|---|---|---|---|---|
1 | Sky | Towner | 2015-12-03 | 17 | stowner1 |
2 | Ben | Davis | 2016-04-20 | 19 | bdavis2 |
3 | Travis | Apple | 2018-08-14 | 18 | tapple3 |
4 | Arthur | David | 2016-04-01 | 16 | adavid4 |
5 | Benjamin | Town | 2014-01-01 | 17 | btown5 |
The above sample table can be created using the code here.
Basic usage
To return the weekday index of the date that current students enrolled:
SELECT fname, DAYOFWEEK(day_enrolled)FROM students;
+----------+-------------------------+| fname | DAYOFWEEK(day_enrolled) |+----------+-------------------------+| Sky | 5 || Ben | 4 || Travis | 3 || Arthur | 6 || Benjamin | 4 |+----------+-------------------------+
We can see that Sky enrolled on a Thursday while Ben enrolled on a Wednesday.
To return students who were enrolled on a Monday or Tuesday:
SELECT fname, DAYOFWEEK(day_enrolled)FROM studentsWHERE DAYOFWEEK(day_enrolled) IN (2, 3);
+--------+-------------------------+| fname | DAYOFWEEK(day_enrolled) |+--------+-------------------------+| Travis | 3 |+--------+-------------------------+
To return weekday index from a datetime:
SELECT DAYOFWEEK('2020-04-12 06:05:55');
+----------------------------------+| DAYOFWEEK('2020-04-12 06:05:55') |+----------------------------------+| 1 |+----------------------------------+
