Use of DATETIME and BETWEEN - Part 2

  • Great question Dwayne!

    Dwayne Dibley (11/18/2011)


    Hi all

    Thanks for the feedback on the question. The results as they stand make for some interesting reading. Only 31% got the answer correct. So this shows that the loss of precision is not as well understood as it could be.

    I understood the percision, but since the QOTD script was a picture instead of text the last 9 looked like a zero for insert 2.

    Maybe that affected the percision or percentage of correct answers?

    😎

  • SanDroid (11/21/2011)


    I understood the percision, but since the QOTD script was a picture instead of text the last 9 looked like a zero for insert 2.

    Interesting.

    That comment surprised me so much that I downloaded the picture, cropped out everything but the 9 at the end of that string, and looked at the bitmap. (Since the image is GIF, there's no lossy compression so the bitmap I see is the one everyone else sees).

    It's very much a clear and obvious 9, not the slightest possibility of taking it for zero unless it is displayed using a ridiculously low pixel size.

    Since I can't imagine you are trying to read text at the size where that would not be a clear 9 without magnification, I think you would have had the same problem with seeing it as a 9 had it been transmitted as text anyway, and your problem with the image might easily have been fixed by application of a screen wipe.

    Tom

  • L' Eomot Inversé (11/22/2011)


    SanDroid (11/21/2011)


    I understood the percision, but since the QOTD script was a picture instead of text the last 9 looked like a zero for insert 2.

    Interesting.

    That comment surprised me so much that I downloaded the picture, cropped out everything but the 9 at the end of that string, and looked at the bitmap. (Since the image is GIF, there's no lossy compression so the bitmap I see is the one everyone else sees).

    It's very much a clear and obvious 9, not the slightest possibility of taking it for zero unless it is displayed using a ridiculously low pixel size.

    Since I can't imagine you are trying to read text at the size where that would not be a clear 9 without magnification, I think you would have had the same problem with seeing it as a 9 had it been transmitted as text anyway, and your problem with the image might easily have been fixed by application of a screen wipe.

    Perhaps that person is not using a digital monitor or is not using the native resolution. Surprisingly a large number of my colleagues change their hi-res monitor to something like 800 x 600 so they can read it easier and that warps all text.

  • cengland0 (11/22/2011)


    L' Eomot Inversé (11/22/2011)


    SanDroid (11/21/2011)


    I understood the percision, but since the QOTD script was a picture instead of text the last 9 looked like a zero for insert 2.

    Interesting.

    That comment surprised me so much that I downloaded the picture, cropped out everything but the 9 at the end of that string, and looked at the bitmap. (Since the image is GIF, there's no lossy compression so the bitmap I see is the one everyone else sees).

    It's very much a clear and obvious 9, not the slightest possibility of taking it for zero unless it is displayed using a ridiculously low pixel size.

    Since I can't imagine you are trying to read text at the size where that would not be a clear 9 without magnification, I think you would have had the same problem with seeing it as a 9 had it been transmitted as text anyway, and your problem with the image might easily have been fixed by application of a screen wipe.

    Perhaps that person is not using a digital monitor or is not using the native resolution. Surprisingly a large number of my colleagues change their hi-res monitor to something like 800 x 600 so they can read it easier and that warps all text.

    Yes, I see your point - but he seems to be saying that it was hard to read because it was an image, and mapping the bitmap (whether generated by the browser or transmitted as a bit-map from the server) to a non-digital monitor or blowing it up to occupy more of the screen will have much the same effect on text as it does on image.

    Tom

  • Dwayne Dibley (11/18/2011)


    So this shows that the loss of precision is not as well understood as it could be.

    I thought I knew the answer. I was wrong. That means I learned something. Great question!

    .

  • Nice question. Thanks.

  • Tricky question on precision of DATETIME. Missed it but learned somthing.

    http://brittcluff.blogspot.com/

  • I generally don't need to compare against time so I will often convert datetime to date before the compare. Fortunately I don't have to do this for large sets of data.

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