DAYOFWEEK/WEEKOFYEAR/DAYOFMONTH/DAYOFYEAR(t) 
DAYOFWEEK(t)/WEEKOFYEAR(t)/DAYOFMONTH(t)/DAYOFYEAR(t) are date functions that provide the following information:
Value t: when used in a function, the expression t (date_or_timestamp_expression) must supply a date, a time stamp, or an alphanumeric value that matches the current date or time stamp format.
|
Result of the Function |
DAYOFWEEK(t) |
Numeric value between 1 and 7 (weekday) The first day is Monday, the second Tuesday, etc. |
WEEKOFYEAR(t) |
Numeric value between 1 and 53 (calendar week of the specified day) |
DAYOFMONTH(t) |
Numeric value between 1 and 31 (day of the month of the specified day) |
DAYOFYEAR(t) |
Numeric value between 1 and 366 (day of the year of the specified day) |
t is a NULL value |
NULL value |