Stairway to Advanced T-SQL Level 9: Compare, Modify, Derive and Validate Date and Time Values

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Stairway to Advanced T-SQL Level 9: Compare, Modify, Derive and Validate Date and Time Values

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Jeff Moden SSC Guru Points: 1004378 More actions · Answer 1

Jack 49290 - Thursday, March 30, 2017 3:45 PM
Can you please elaborate onQ1? Based on the chart at the top, the shortest a DATETIMEOFFSET can be is 8 and the longest aDATETIME2 can be is 8 so â€œAT BESTâ€ they are equal.

Apparently, this author doesn't respond to questions about his articles.

DATETIME2(3) and DATETIME2(4) both only take 7 bytes. DATETIME takes 8 bytes. DATETIMEOFFSET(3) and DATETIMEOFFSET(4) both take 9 bytes. Answer "B" is NOT the correct answer to the question. Answer "C" is the correct answer.

--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)

fompro Grasshopper Points: 20 More actions · Answer 2

Incorrect answer to the first question. See:

declare @dt datetime = getdate(), @dt2 datetime2(3) = sysdatetime(), @DtOff datetimeoffset(3) = SysDateTimeOffset()

select datalength(@Dt) as [datetime], datalength(@Dt2) as [datetime2(3)], datalength(@DtOff) as [datetimeoffset(3)]

MORE space is C!

Захват664

Microsoft SQL Server 2016 (SP2) (KB4052908) - 13.0.5026.0 (X64)

fompro Grasshopper Points: 20 More actions · Answer 3