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MySQL | WEEKDAY method

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schedule Jul 1, 2022
Last updated
local_offer MySQL
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tocTable of Contents
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MySQL's WEEKDAY(~) method returns the weekday index (0-6) of a given date or datetime.

Weekday Index

Weekday

0

Monday

1

Tuesday

2

Wednesday

3

Thursday

4

Friday

5

Saturday

6

Sunday

Parameters

1. date | date/datetime

The date/datetime to retrieve the weekday index for.

Return value

The weekday index (0-6) of the input 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, WEEKDAY(day_enrolled)
FROM students;
+----------+-----------------------+
| fname | WEEKDAY(day_enrolled) |
+----------+-----------------------+
| Sky | 3 |
| Ben | 2 |
| Travis | 1 |
| Arthur | 4 |
| Benjamin | 2 |
+----------+-----------------------+

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, WEEKDAY(day_enrolled)
FROM students
WHERE WEEKDAY(day_enrolled) IN (0, 1);
+--------+-----------------------+
| fname | WEEKDAY(day_enrolled) |
+--------+-----------------------+
| Travis | 1 |
+--------+-----------------------+

To return weekday index from a datetime:

SELECT WEEKDAY('2020-04-12 06:05:55');
+--------------------------------+
| WEEKDAY('2020-04-12 06:05:55') |
+--------------------------------+
| 6 |
+--------------------------------+
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Published by Arthur Yanagisawa
Edited by 0 others
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