SQL finding overlapping of times pass midnight (across 2 days)

Posted by janechii on Stack Overflow See other posts from Stack Overflow or by janechii
Published on 2010-05-03T18:25:18Z Indexed on 2010/05/03 18:28 UTC
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Hi everyone,

I know there are lots of these types of questions, but i didn't see one that was similar enough to my criteria. So i'd like to ask for your help please. The fields i have are just start and end which are of time types. I cannot involve any specific dates in this. If the time ranges don't go pass midnight across day, i'd just compare two tuples as such:

end1 > start2 AND start1 < end2

(end points touching are not considered overlapped here.)

But when I involve time range that pass (or at) midnight, this obviously doesn't work. For example, given:

 start  |   end
--------+--------
06:00PM | 01:00AM
03:00PM | 09:00PM

Without involving dates, how can i achieve this, please. My assumption is, if end is less than start, then we're involving 2 days.

I'm trying to do this in plain standard SQL, so just a simple and concise logic in the WHERE clause.

Thank you everyone!

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