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:

derive type:single value:WEEKDAY(MyDate)

Output: Generates a column of values containing the numeric weekday values derived from the MyDate column.

derive type:single value:WEEKDAY(datetime_col)

ArgumentRequired?Data TypeDescription
datetime_colYdatetimeName of column whose weekday values are to be computed

datetime_col

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

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 TypeExample Value
YesDatetimemyDate

Example - Day of Date functions