More Precedence

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More Precedence

Avinash

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Points: 12
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November 6, 2017 at 9:49 pm

#340427

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Stewart "Arturius" Campbell SSC Guru Points: 72634 More actions · Answer 1

That is really interesting.
Pity this cannot be effected on the new datetime datatypes (e.g. datetime2)
thanks for the question, Avinash

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Mighty SSCrazy Eights Points: 9063 More actions · Answer 2

Is there an explanation why 0x20 (32) results in 107 milliseconds?

Thomas Rushton SSC-Insane Points: 22649 More actions · Answer 3

Mighty - Tuesday, November 7, 2017 1:47 AM
Is there an explanation why 0x20 (32) results in 107 milliseconds?

Spoiler:
Ë™sÉ¯ã„¥0Æ– xoÉ¹ddÉ sá´‰ ÇsoÉ¥Ê‡ ÉŸo á„…Æ ;puoÉ”Çs É ÉŸo É¥Ê‡00Æ/Æ– sá´‰ ÇdÊŽÊ‡ÉÊ‡Ép ÇÉ¯á´‰Ê‡ÇÊ‡Ép ÇÉ¥Ê‡ uá´‰ ÇÉ¯á´‰Ê‡ ÉŸo uoá´‰sá´‰ÊŒá´‰pqns Ê‡sÇllÉÉ¯s ÇÉ¥â”´

Thomas Rushton
blog: https://thelonedba.wordpress.com

Mighty SSCrazy Eights Points: 9063 More actions · Answer 4

ThomasRushton - Tuesday, November 7, 2017 4:21 AM
Mighty - Tuesday, November 7, 2017 1:47 AM
Is there an explanation why 0x20 (32) results in 107 milliseconds?
Spoiler:
Ë™sÉ¯ã„¥0Æ– xoÉ¹ddÉ sá´‰ ÇsoÉ¥Ê‡ ÉŸo á„…Æ ;puoÉ”Çs É ÉŸo É¥Ê‡00Æ/Æ– sá´‰ ÇdÊŽÊ‡ÉÊ‡Ép ÇÉ¯á´‰Ê‡ÇÊ‡Ép ÇÉ¥Ê‡ uá´‰ ÇÉ¯á´‰Ê‡ ÉŸo uoá´‰sá´‰ÊŒá´‰pqns Ê‡sÇllÉÉ¯s ÇÉ¥â”´

That spoiled it! 😉

Budd Hall of Fame Points: 3781 More actions · Answer 5

Adding a binary value to datetime is not the same as adding an integer value. - this I know.
Adding 32 to datetime adds 32 days
Adding x20 to datetime adds 107 milliseconds
WHY - THAT I DON'T KNOW, YET!!

Lynn Pettis SSC Guru Points: 442467 More actions · Answer 6

Because it isn't adding 32 to the date time value:

NewDate DateAsBinary NewDateAsBinary ----------------------- ------------------------------------------------------------------ ------------------------------------------------------------------ 2001-01-01 00:00:00.107 0x0000901A00000000 0x0000901A00000020

Budd Hall of Fame Points: 3781 More actions · Answer 7

That I can understand. However 🙂
Where is the logic in doing a calculation in a different datatype than what the result will be displayed as?

Budd Hall of Fame Points: 3781 More actions · Answer 8

Budd

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Points: 3781

November 7, 2017 at 12:01 pm

#1967037

OH and BTW thank you for your answer.

Ed Wagner SSC Guru Points: 287026 More actions · Answer 9

I enjoy date math. Thomas explained the answer above.

If you add an integer to a datetime data type, it adds that number of days and returns the correct datetime. This meets the standard of date + interval = new date.

Not so with datetime2. It gives an operand type clash error.
The one that really gets me is the date data type. It gives the same error.

Microsoft did a lot of things right with the datetime type, but missed the boat with the newer ones. I don't know why they made the decisions they did.
DATEADD works with both, but not straight addition and subtraction.

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Jeff Moden SSC Guru Points: 1004403 More actions · Answer 10

Budd - Tuesday, November 7, 2017 12:00 PM
That I can understand. However 🙂
Where is the logic in doing a calculation in a different datatype than what the result will be displayed as?

In this particular case (binary level), probably nothing other than finding out if you actually know how the DATETIME datatype works. In real life, I use direct date math a lot (but not at the binary level).

--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.

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