DAYOFWEEK Function - SQL
Overview
The DAYOFWEEK function in SQL returns the weekday index for a given date, where 1 represents Sunday and 7 represents Saturday. It is useful for determining the position of a day within the week.
Example:
SELECT
DAYOFWEEK('2000-04-15')
Syntax:
SELECT
DAYOFWEEK(date)
date is the date from which you want to extract the weekday index.
Sample Data:
| first_name | birthday |
|---|---|
| Frank | 1994-03-15 00:00:00 |
| Jane | 1980-06-14 00:00:00 |
| Ashley | 1975-12-05 00:00:00 |
| Glenn | 1988-03-23 00:00:00 |
| Kelly | 1979-10-11 00:00:00 |
| Richard | 1985-08-30 00:00:00 |
| George | 1992-02-18 00:00:00 |
| Kyle | 1983-04-07 00:00:00 |
| James | 1978-09-27 00:00:00 |
| Gustavo | 1987-11-21 00:00:00 |
Example: Hard-coded value
In this example, we are returning the day of week for the date ‘2000-04-15,’ the final output is 7.
Example: Query without the WHERE Statement
In this example, we are returning the day of week for all of the rows in the birthday column.
Example: Query with the WHERE Statement
In this example, we are returning the day of week for the rows in the birthday column where the first_name column equals ‘Kelly.’
