How to Get the Day of the Week from a Date in SQL Server 2005/2008?

Get day of the week in SQL Server 2005/2008

Question:

How to determine the day of the week corresponding to a specific date (such as January 1, 2009) using SQL Server 2005/2008? Is there a built-in function that can perform this task, or do I need to resort to an auxiliary table?

Answer:

SQL Server 2005/2008 provides built-in functions to retrieve the day of the week from a date. You can use DATENAME or DATEPART to achieve this:

Use DATENAME:

SELECT DATENAME(dw, GETDATE()) -- 输出：星期五

In the DATENAME function, "dw" represents the day of the week. It returns a string representing the day of the week, such as "Monday" or "Tuesday".

Use DATEPART:

SELECT DATEPART(dw, GETDATE()) -- 输出：6

DATEPART, on the other hand, returns the day of the week as an integer. Integer values ​​range from 1 to 7, where 1 corresponds to Sunday and 7 corresponds to Saturday.

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