Get all StudentIds for each consecutive date

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Get all StudentIds for each consecutive date

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SwePeso SSC-Dedicated Points: 39757 More actions · Answer 1

SELECT          StudentId
FROM            @student
GROUP BY        StudentId
HAVING          COUNT(DISTINCT SubmissionDate) > GREATEST(2, DATEDIFF(DAY, MIN(SubmissionDate), MAX(SubmissionDate)));

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Jeff Moden SSC Guru Points: 1004309 More actions · Answer 2

SwePeso wrote:

SELECT          StudentId
FROM            @student
GROUP BY        StudentId
HAVING          COUNT(DISTINCT SubmissionDate) > GREATEST(2, DATEDIFF(DAY, MIN(SubmissionDate), MAX(SubmissionDate)));

Unfortunately, GREATEST isn't available in 2019, which is what this forum is.

That is a pretty cool usage of greatest though.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

SwePeso SSC-Dedicated Points: 39757 More actions · Answer 3

You can substitute this simple GREATEST with a CASE WHEN THEN END statement.