The
DAYOFWEEK function returns the day of the week in the argument as
an integer value in the range 1-7, where 1 represents Sunday.
>>-DAYOFWEEK--(--expression--)---------------------------------><
- expression
- An expression that returns a value of one of the following built-in
data types: a DATE, TIMESTAMP, or a valid character string representation
of a date or timestamp that is not a CLOB. In a Unicode database,
if a supplied argument is a graphic string, it is first converted
to a character string before the function is executed.
The result of the function is INTEGER. The result can
be null; if the argument is null, the result is the null value.