MySQL - WEEKDAY() Function

The DATE, DATETIME and TIMESTAMP datatypes in MySQL are used to store the date, date and time, time stamp values respectively. Where a time stamp is a numerical value representing the number of milliseconds from '1970-01-01 00:00:01' UTC (epoch) to the specified time. MySQL provides a set of functions to manipulate these values.

The MYSQL WEEKDAY() function is used to retrieve the index of the weekday of the given date. This function returns a numerical value which can be one of the following − 0 for Monday, 1 for Tuesday, 2 for Wends day, 3 for Thursday, 4 for Friday, 5 for Saturday and 6 for Sunday.

Syntax

Following is the syntax of the above function –

WEEKDAY(date);

Where, date is the date value from which you need to extract the day of the week (index).

Example 1

Following example demonstrates the usage of the WEEKDAY() function –

mysql> SELECT WEEKDAY('2019-05-25');
+-----------------------+
| WEEKDAY('2019-05-25') |
+-----------------------+
|                     5 |
+-----------------------+
1 row in set (0.03 sec)

Example 2

Following is another example of this function –

mysql> SELECT WEEKDAY('1998-11-21');
+-----------------------+
| WEEKDAY('1998-11-21') |
+-----------------------+
|                     5 |
+-----------------------+
1 row in set (0.00 sec)

Example 3

If the day part in the given date is 0 this function returns NULL —

mysql> SELECT WEEKDAY('2017-00-00');
+-----------------------+
| WEEKDAY('2017-00-00') |
+-----------------------+
|                  NULL |
+-----------------------+
1 row in set, 1 warning (0.00 sec)

mysql> SELECT WEEKDAY('1789-02-00');
+-----------------------+
| WEEKDAY('1789-02-00') |
+-----------------------+
|                  NULL |
+-----------------------+
1 row in set, 1 warning (0.00 sec)

Example 4

If you pass an empty string or a non-string value as an argument this function returns NULL.

mysql> SELECT WEEKDAY('');
+-------------+
| WEEKDAY('') |
+-------------+
|        NULL |
+-------------+
1 row in set, 1 warning (0.00 sec)

mysql> SELECT WEEKDAY(1990-11-11);
+---------------------+
| WEEKDAY(1990-11-11) |
+---------------------+
|                NULL |
+---------------------+
1 row in set, 1 warning (0.00 sec)

Example 5

We can also pass the date-time expression as an argument to this function –

mysql> SELECT WEEKDAY('2015-09-05 09:40:45.2300');
+-------------------------------------+
| WEEKDAY('2015-09-05 09:40:45.2300') |
+-------------------------------------+
|                                   5 |
+-------------------------------------+
1 row in set (0.00 sec)

Example 6

In the following example we are retrieving weekday index from the current date —

mysql> SELECT WEEKDAY(CURDATE());
+--------------------+
| WEEKDAY(CURDATE()) |
+--------------------+
|                  2 |
+--------------------+
1 row in set (0.00 sec)

Example 7

In the following example we are retrieving the weekday index from the current timestamp —

mysql> SELECT WEEKDAY(CURRENT_TIMESTAMP());
+------------------------------+
| WEEKDAY(CURRENT_TIMESTAMP()) |
+------------------------------+
|                            2 |
+------------------------------+
1 row in set (0.00 sec)

Example 8

You can also pass the column name as an argument to this function. Let us create a table with name MyPlayers in MySQL database using CREATE statement as shown below –

mysql> CREATE TABLE MyPlayers(
	ID INT,
	First_Name VARCHAR(255),
	Last_Name VARCHAR(255),
	Date_Of_Birth date,
	Place_Of_Birth VARCHAR(255),
	Country VARCHAR(255),
	PRIMARY KEY (ID)
);
Now, we will insert 7 records in MyPlayers table using INSERT statements:
mysql> insert into MyPlayers values(1, 'Shikhar', 'Dhawan', DATE('1981-12-05'), 'Delhi', 'India');
mysql> insert into MyPlayers values(2, 'Jonathan', 'Trott', DATE('1981-04-22'), 'CapeTown', 'SouthAfrica');
mysql> insert into MyPlayers values(3, 'Kumara', 'Sangakkara', DATE('1977-10-27'), 'Matale', 'Srilanka');
mysql> insert into MyPlayers values(4, 'Virat', 'Kohli', DATE('1988-11-05'), 'Delhi', 'India');
mysql> insert into MyPlayers values(5, 'Rohit', 'Sharma', DATE('1987-04-30'), 'Nagpur', 'India');
mysql> insert into MyPlayers values(6, 'Ravindra', 'Jadeja', DATE('1988-12-06'), 'Nagpur', 'India');
mysql> insert into MyPlayers values(7, 'James', 'Anderson', DATE('1982-06-30'), 'Burnley', 'England');

Following query extracts the weekday index from all the entities of the Date_Of_Birth column of the table MyPlayers —

mysql> SELECT First_Name, Last_Name, Date_Of_Birth, Country,
WEEKDAY(Date_Of_Birth) FROM MyPlayers;
+------------+------------+---------------+-------------+------------------------+
| First_Name | Last_Name  | Date_Of_Birth | Country     | WEEKDAY(Date_Of_Birth) |
+------------+------------+---------------+-------------+------------------------+
| Shikhar    | Dhawan     | 1981-12-05    | India       |                      5 |
| Jonathan   | Trott      | 1981-04-22    | SouthAfrica |                      2 |
| Kumara     | Sangakkara | 1977-10-27    | Srilanka    |                      3 |
| Virat      | Kohli      | 1988-11-05    | India       |                      5 |
| Rohit      | Sharma     | 1987-04-30    | India       |                      3 |
| Ravindra   | Jadeja     | 1988-12-06    | India       |                      1 |
| James      | Anderson   | 1982-06-30    | England     |                      2 |
+------------+------------+---------------+-------------+------------------------+
7 rows in set (0.00 sec)

Example 9

Suppose we have created a table named dispatches_data with 5 records in it using the following queries –

mysql> CREATE TABLE dispatches_data(
	ProductName VARCHAR(255),
	CustomerName VARCHAR(255),
	DispatchTimeStamp timestamp,
	Price INT,
	Location VARCHAR(255)
);
insert into dispatches_data values('Key-Board', 'Raja', TIMESTAMP('2019-05-04', '15:02:45'), 7000, 'Hyderabad');
insert into dispatches_data values('Earphones', 'Roja', TIMESTAMP('2019-06-26', '14:13:12'), 2000, 'Vishakhapatnam');
insert into dispatches_data values('Mouse', 'Puja', TIMESTAMP('2019-12-07', '07:50:37'), 3000, 'Vijayawada');
insert into dispatches_data values('Mobile', 'Vanaja' , TIMESTAMP ('2018-03-21', '16:00:45'), 9000, 'Chennai');
insert into dispatches_data values('Headset', 'Jalaja' , TIMESTAMP('2018-12-30', '10:49:27'), 6000, 'Goa');

Following query retrieves the day of the weekday index values from the DispatchTimeStamp column —

mysql> SELECT ProductName, CustomerName, DispatchTimeStamp, Price,
WEEKDAY(DispatchTimeStamp) FROM dispatches_data;
+-------------+--------------+---------------------+-------+----------------------------+
| ProductName | CustomerName | DispatchTimeStamp   | Price | WEEKDAY(DispatchTimeStamp) |
+-------------+--------------+---------------------+-------+----------------------------+
| Key-Board   | Raja         | 2019-05-04 15:02:45 | 7000  |                          5 |
| Earphones   | Roja         | 2019-06-26 14:13:12 | 2000  |                          2 |
| Mouse       | Puja         | 2019-12-07 07:50:37 | 3000  |                          5 |
| Mobile      | Vanaja       | 2018-03-21 16:00:45 | 9000  |                          2 |
| Headset     | Jalaja       | 2018-12-30 10:49:27 | 6000  |                          6 |
+-------------+--------------+---------------------+-------+----------------------------+
5 rows in set (0.00 sec)

Example 10

Suppose we have created a table named SubscriberDetails with 5 records in it using the following queries –

mysql> CREATE TABLE SubscriberDetails (
	SubscriberName VARCHAR(255),
	PackageName VARCHAR(255),
	SubscriptionTimeStamp timestamp
);
insert into SubscriberDetails values('Raja', 'Premium', TimeStamp('2020-10-21 20:53:49'));
insert into SubscriberDetails values('Roja', 'Basic', TimeStamp('2020-11-26 10:13:19'));
insert into SubscriberDetails values('Puja', 'Moderate', TimeStamp('2021-03-07 05:43:20'));
insert into SubscriberDetails values('Vanaja', 'Basic', TimeStamp('2021-02-21 16:36:39'));
insert into SubscriberDetails values('Jalaja', 'Premium', TimeStamp('2021-01-30 12:45:45'));

Following query retrieves and displays the weekday index of subscription for all the users —

mysql> SELECT SubscriberName, PackageName, SubscriptionTimeStamp,
WEEKDAY(SubscriptionTimeStamp) FROM SubscriberDetails;
-----------------+-------------+-----------------------+--------------------------------+
| SubscriberName | PackageName | SubscriptionTimeStamp | WEEKDAY(SubscriptionTimeStamp) |
+----------------+-------------+-----------------------+--------------------------------+
| Ram            | Premium     | 2020-10-21 20:53:49   |                              2 |
| Rahman         | Basic       | 2020-11-26 10:13:19   |                              3 |
| Robert         | Moderate    | 2021-03-07 05:43:20   |                              6 |
| Radha          | Basic       | 2021-02-21 16:36:39   |                              6 |
| Rajiya         | Premium     | 2021-01-30 12:45:45   |                              5 |
+----------------+-------------+-----------------------+--------------------------------+
5 rows in set (0.00 sec)
mysql-date-time-functions.htm
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