The WEEK function returns an integer between 1 and 54 that represents the week of the year. The week starts with Sunday, and January 1 is always in the first week.
If expression is a character or graphic string, it must not be a CLOB or DBCLOB and its value must be a valid string representation of a date or timestamp. For the valid formats of string representations of dates and timestamps, see String representations of datetime values.
The result of the function is a large integer. If the argument can be null, the result can be null; if the argument is null, the result is the null value.
SELECT WEEK(PRENDATE) INTO :WEEK FROM PROJECT WHERE PROJNO = 'PL2100'Results in WEEK being set to 38.
SELECT DATE_1, WEEK(DATE_1) FROM XResults in the following list shows what is returned by the WEEK function for various dates.
1997-12-28 53 1997-12-31 53 1998-01-01 1 1999-01-01 1 1999-01-04 2 1999-12-31 53 2000-01-01 1 2000-01-03 2
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