MySQL: DAYOFWEEK() Function; In this tutorial, we will learn how to use mysql DAYOFWEEK() function with the help of examples.
When we need to get day of week of given date in mysql query, at that time we could use to mysql DAYOFWEEK () function. And it will return numeric value.
As well as, We will take some example of with mysql various function like, CURDATE(), NOW() etc.
MySQL DAYOFWEEK() Function
In MySQL, the DAYOFWEEK() is used to return the day of the week from a date.
Syntax
The DAYOFWEEK() function syntax is:
DAYOFWEEK(date)
The date here is the date value that you want the day of the week from which you returned.
Example-1
Now we take an example to demonstrate.
SELECT DAYOFWEEK('2020-06-18') AS 'Result';
Output-1
+--------+ | Result | +--------+ | 5 | +--------+
Example-2
If there is a leading zero in the part of the day, then the leading zero has been left out of the result.
SELECT DAYOFWEEK('2019-03-15') AS 'Result';
Output-2
+--------+ | Result | +--------+ | 6 | +--------+
Example-3 | Database Example
Next database example, we take an example for demostration with database.
SELECT created_at AS create_date, DAYNAME(created_at) AS 'Day Name', DAYOFWEEK(created_at) AS day_of_week FROM users WHERE id= 112;
Output-3
+---------------------+-----------+-------------+ | create_date | Day Name | Day of Week | +---------------------+-----------+-------------+ | 2005-05-25 11:30:37 | Wednesday | 4 | +---------------------+-----------+-------------+
Example-4 | Current Date/Time
Let’s take another example , extracting part of the day from the current date and time (which is now returned using the () function).
SELECT NOW(), DAYOFWEEK(NOW());
Output-4
+---------------------+--------------------+ | NOW() | DAYOFWEEK(NOW()) | +---------------------+--------------------+ | 2019-07-10 18:30:44 | 6 | +---------------------+--------------------+
Example-4 | CURDATE() Function
Let’s take a another example of using CURDATE() function. Basically CURDATE() function returns only the date without time.
SELECT CURDATE(), DAYOFWEEK(CURDATE());
Output-5
+------------+-----------------------+ | CURDATE() | DAYOFWEEK(CURDATE()) | +------------+-----------------------+ | 2019-05-15 | 6 | +------------+-----------------------+
Example-6 DAYOFWEEK() v/s DAYOFMONTH()
Now let us take an example to explain the difference between DAYOFWEEK() and DAYOFMONTH() function of MySQL.
SET @date = '2020-02-15';
SELECT
@date AS 'DATE',
DAYNAME(@date) AS 'Day Name',
DAYOFWEEK(@date) AS 'Day of Week',
DAYOFMONTH(@date) AS 'Day of Month';
Output-6
+------------+----------+-------------+--------------+ | @date | Day Name | Day of Week | Day of Month | +------------+----------+-------------+--------------+ | 2020-02-15 | Saturday | 7 | 15 | +------------+----------+-------------+--------------+
Note:
- DAYOFMONTH () function returns the value between 1 and 31
- On the other hand, the DAYOFWEEK () function returns a value between 1 and 7.
Example-7 of WEEKDAY() vs DAYOFWEEK()
In example-7, we take an example to differentiate weekday() and dayofweek() function.
SET @date = '2019-07-13'; SELECT DAYOFWEEK(@date) AS 'Day OF WEEK', WEEKDAY(@date) AS 'Weekday';
| WEEKDAY() | DayofWeek() |
| MySQL WEEKDAY() function returns the weekday number for a given date(between 0 to 6). | MySQL DAYOFWEEK() function returns the weekday index for a given date (between 1 to 7). |
| 1 to 7 means: 1=Sunday, 2=Monday, 3=Tuesday, 4=Wednesday, 5=Thursday, 6=Friday, 7=Saturday. | 0 to 6 means: 0 = Monday, 1 = Tuesday, 2 = Wednesday, 3 = Thursday, 4 = Friday, 5 = Saturday, 6 = Sunday. |
Output-7
+----------+-----------------+ | Day Of Name | Weekday | +-------------+--------------+ | 7 | 5 | +-------------+--------------+
Conclusion
Here, You have learned how to use mysql DAYOFWEEK() function with various examples.
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