I was looking for a simple function to get the week of the month (rather than the easy week of the year) in a mysql query.
The best I could come up with was:
WEEK(dateField) - WEEK(DATE_SUB(dateField, INTERVAL DAYOFMONTH(dateField)-1 DAY)) + 1
AFAIK, there is no standard on the first week of month.
First week of year is the week containing
How do you define first week of month?
You'll need to rewrite your query like this:
SELECT WEEK(dateField, 5) - WEEK(DATE_SUB(dateField, INTERVAL DAYOFMONTH(dateField) - 1 DAY), 5) + 1
so that the year transitions are handled correctly, and the weeks start on
Otherwise, your query is fine.