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Derives the numeric value for the day of the week (1, 2, etc.). Input must be a reference to a column containing Datetime values.

NOTE: If the source Datetime value does not include a valid input for this function, a missing value is returned.

Tip: You can use the DATEFORMAT function to generate text versions of the day of the week. See Examples below.

Column reference example:

weekday(MyDate)

Output: Returns the numeric weekday values derived from the MyDate column.

weekday(datetime_col)

Argument	Required?	Data Type	Description
datetime_col	Y	datetime	Name of column whose weekday values are to be computed

Name of the column whose day-of-week value is to be computed.

Missing values for this function in the source data result in missing values in the output.
Multiple columns and wildcards are not supported.

Tip: You cannot insert constant Datetime values as inputs to this function. However, you can use the following: WEEKDAY(DATE(12,20,2017)) .

Required?	Data Type	Example Value
Yes	Datetime	`myDate`