dayofweek function
Applies to: 
Databricks SQL Databricks Runtime
Returns the day of week of the date or timestamp. This function is a synonym for extract(DAYOFWEEK FROM expr).
Syntax
dayofweek(expr)
Arguments
expr: A DATE or TIMESTAMP expression.
Returns
An INTEGER where 1 = Sunday, and 7 = Saturday.
Examples
SQL
> SELECT dayofweek('2009-07-30');
5