How Can I Determine the Day of the Week from a Date in SQL Server?

Determine the day of the week in SQL Server

When working with dates in SQL Server, determining the corresponding day of the week is a very common requirement. For example, given the date "January 1, 2009," you might want to determine whether it is Monday, Tuesday, and so on.

Built-in functions

Fortunately, SQL Server provides built-in functions to simplify this task without the need for auxiliary tables.

1. DATENAME

The DATENAME function returns the specified part of the date as a string. To get the day of the week, use the "dw" parameter:

SELECT DATENAME(dw, GETDATE())
-- 星期五

2. DATEPART

The DATEPART function works similarly, but it returns the specified part of the date as an integer. For day of the week, use the "dw" parameter:

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

In this case, the integer 6 represents Friday because dates in SQL Server are numbered from 1 (Sunday) to 7 (Saturday).

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