Find the same day in a range then find the difference between the days
Need assistnace with the following .
I have a table of ids for courses and each course class is on a day. I have to take the first day the course class is on and find the next same day then work out the difference in days.
eg. a course class is on a saturday then have to go thru the course class associated to a course and find the next saturday then work out the difference.
Anyone able to help - it would be much appreciated
course class id date day
abcdefa 18/12/2002 wednesday
abcdefb 19/12/2002 thursday
abcdefc 20/12/2002 friday
zxvyza 17/12/2002 monday
zxvyzb 20/12/2002 thursday
zxvyzc 21/12/2002 friday
zxvyzd 24/12/2002 monday
zxvyze 26/12/2002 wednesday
lmnopa 11/11/2002 tuesday
lmnopb 12/11/2002 wednesday
lmnopc 14/11/2002 friday
lmnopd 19/11/2002 wednesday
lmnope 21/11/2002 friday
where abcdefa, abcdefbc, abcdefc are for course id abcdef
and the other set of course class ids are for course id zxvyz.
and 3rd set relates to course id lmnop.
expectation:
the difference between days for the first set of data to be 0
the difference between days for 2nd set to be 7 days (ie. take the first day for the course class and see if can find another that is the same and then work out the difference i.e monday) then return the difference then go to next course class id.
the diff between 3rd set is calc the diff between Wednesdays, ignore the last friday and find the next course class id. the answer here will be 7 days.
I have worked out the days from the dates (although the above is only an example)but wasnt sure how to pick the same days then work out the difference and then move to the next course class id. Some course classes wont have another same day.
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