SQL Date Function DAYNAME()

The DAYNAME() function is a SQL function used to extract the name of the day of the week from a date or datetime value. It takes one argument, which is the date or datetime value from which the day of the week will be extracted.

Here's an example of how to use the DAYNAME() function in a SQL query:

SELECT DAYNAME('2022-02-28');

This query will return the string value "Monday", which is the name of the day of the week for the date "2022-02-28".

Note that the DAYNAME() function is specific to the database management system you are using, and the syntax and date format it supports may vary slightly depending on the system. Additionally, the DAYNAME() function only extracts the name of the day of the week from a date or datetime value, and does not take into account other components such as the year or month.