New Year's Math

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New Year's Math

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Sean Lange

Posted Thursday, January 03, 2013 8:54 AM

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Good topic for a question. However since I always try to get the answer without running the code I tend to really dislike questions with this level of nested logic. I am horrible at being a sql engine but pretty decent at deciphering code. I was unable to keep focus long enough to decipher the overly complicated query. I think you could have presented the idea with a far less complicated query.

That being said the explanation was good and it is always good to have a refresher on how these functions work. Thanks for the question.

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Post #1402421

mtassin

Posted Thursday, January 03, 2013 9:09 AM

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I solved it like Toreador, but at the same time I found the explanation about the literals interesting.

thanks for the question!

--Mark Tassin
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Post #1402430

Revenant

Posted Thursday, January 03, 2013 9:52 AM

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Interesting question -- I figured out the date math but had to find what that ODBC syntax was about. There is always something new or so far unexplored to learn. Thanks!

Post #1402459

L' Eomot Inversé

Posted Thursday, January 03, 2013 6:15 PM

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Nice question. I enjoyed it.

The "flying duck" code layout made it easy to check that the parentheses matched up, so could see easily that there was no syntax error unless it was caused by those strange literals. So I had to find out what those strange literals were before going any further. First I hit on Date, Time, and Timestamp Literals but the nasty typo on that page ("-type" for "literal-type") confused me so I looked further and found Date, Time, and Timestamp Escape Sequences which gave me what I needed (and showed clearly that my confusion with the earlier page was due to a typo) so now I knew there wasn't a syntax error.

So then I could follow a process much like what some others have mentioned. Since a lot of things were added, all integer multiples of one second and none of them zero, the miliseconds in the result had to be the same as in the starting point (non-zero) and the resulting datetime had to be greater than the starting point - so only one of the options fitted the bill. No need to do any arithmetic - but it made me think!

Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)

Post #1402629