Calculate Day Of Week in SQL Server

You can calculate the day of the week in SQL Server using the `DATEPART` function, which allows you to extract various parts of a date, including the day of the week. The `DATEPART` function takes two arguments: the date part to be extracted and the date from which to extract it.

Here's how you can calculate the day of the week in SQL Server:

```sql

SELECT DATENAME(weekday, GETDATE()) AS DayOfWeek;

```

In this example, `GETDATE()` returns the current date and time, and `DATENAME(weekday, GETDATE())` extracts the day of the week. The `AS DayOfWeek` alias gives a name to the result column.

If you want to calculate the day of the week for a specific date rather than the current date, you can replace `GETDATE()` with the date you want to evaluate:

```sql

DECLARE @YourDate DATETIME = '2023-10-13'; -- Replace with your desired date

SELECT DATENAME(weekday, @YourDate) AS DayOfWeek;

```

This SQL code will return the day of the week for the specified date.

Keep in mind that `DATENAME` will return the day of the week as a string, such as 'Sunday', 'Monday', etc. If you prefer the day of the week as a number (1 for Sunday, 2 for Monday, and so on), you can use `DATEPART` as follows:

```sql

SELECT DATEPART(weekday, GETDATE()) AS DayOfWeek;

```

The `DATEPART` function will return the numerical representation of the day of the week.

Remember that the specific day numbering may vary depending on your SQL Server configuration. In most cases, Sunday is 1 and Saturday is 7, but it's a good practice to verify the configuration and, if necessary, adjust the numbering accordingly.

Day Of Week As String SQL Server

In SQL Server, you can convert a date or datetime value into the day of the week as a string using the `DATENAME` function. Here's an example of how you can use it:

```sql

SELECT DATENAME(weekday, GETDATE()) AS DayOfWeekAsString

```

In this example, `GETDATE()` returns the current date and time, and `DATENAME(weekday, GETDATE())` will return the name of the day of the week as a string, such as "Sunday," "Monday," etc.

You can replace `GETDATE()` with any date or datetime value you want to convert into the day of the week as a string.