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MySQL | DAYOFWEEK method

schedule Aug 12, 2023
Last updated
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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 students
WHERE 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 |
+----------------------------------+
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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