microsoft.public.sqlserver.programming Google Group

Re: Interesting observation: new SQL time machine! :)

esq...@sommarskog.se (Erland Sommarskog) — Fri, 11 Nov 2009 23:02:34 UT

Actually, it might be more to it than just the difference in types. Some
time back I ran some performance tests, and my test procedures looked like
this:
DECLARE @start datetime2(3)
SELECT @start = sysdatetime()

INSERT #Str_JOIN (wordno, guid)
SELECT u.wordno, u.guid
FROM usrdictwords u

Re: Interesting observation: new SQL time machine! :)

s...@nospam.org (Jay) — Fri, 11 Nov 2009 22:47:39 UT

Interesting.
Change the datetime2 to a precision of 3 and you can see why the 1st value
can be greater than the 2nd.
Definite rounding issue.

Re: Why can't recursive queries contain...?

esq...@sommarskog.se (Erland Sommarskog) — Fri, 11 Nov 2009 22:48:29 UT

Rather than using an UDA, you can use FOR XML PATH for this. Here is
an example:
select CustomerID,
substring(OrdIdList, 1, datalength(OrdIdList)/2 - 1)
-- strip the last ',' from the list
from
Customers c cross apply
(select convert(nvarchar(30), OrderID) + ',' as [text()]

Re: Interesting observation: new SQL time machine! :)

sorrytoomuchspamalre...@xs4all.nl (Gert-Jan Strik) — Fri, 11 Nov 2009 22:45:34 UT

Thanks for the correction and explanation.
Your example shows that the GETDATE() function crosses boundaries only
after that specific time is reached. In other words, it will not return
'14:00:25.923' until it actually is 14:00:25.923000.
I find that peculiar. I would argue that it is not correct. If the

Re: Interview question...

esq...@sommarskog.se (Erland Sommarskog) — Fri, 11 Nov 2009 22:33:37 UT

I think the important part is that the candidate understands the context.
If he understands that he may be supposed to ask, it is likely that he
will. But if he thinks that the questions are meant to have one correct
answer, he would also believe that asking questions may lower his ranking.
And, mind you, not all people asking questions, know what they are asking

Re: Weekdays

tomcoo...@comcast.net (Tom Cooper) — Fri, 11 Nov 2009 21:41:48 UT

I'm not sure what the tutorial was trying to demonstrate. But, yes, IMO
that would be a very bad way to get that result set in a production
environment. Very Inefficient.
Tom

Re: Weekdays

ad...@geocodenet.com (Michael Coles) — Fri, 11 Nov 2009 21:36:26 UT

As a demo it does illustrate the use of DATEFIRST, DATEPART, and DATENAME.
That said, I wouldn't put this in production code. You're performing a
DISTINCT query against the Sales.SalesOrderHeader, which may contain many
millions of rows which would make this query inefficient. Additionally
Sales.SalesOrderHeader could contain less than 7 rows, in which case you'll

Weekdays

s...@nospam.org (Jay) — Fri, 11 Nov 2009 21:12:10 UT

I'm going through a tutorial and found they are using the following code:
SET DATEFIRST 1;
SELECT DISTINCT
DATEPART(weekday, S.OrderDate) as WeekDayNumber,
DATENAME(weekday, S.OrderDate) as Weekday
FROM Sales.SalesOrderHeader S
Order by WeekDayNumber
It returns:
1 Monday
2 Tuesday

Re: Why can't recursive queries contain...?

ad...@geocodenet.com (Michael Coles) — Fri, 11 Nov 2009 20:58:08 UT

There you go Michael C, Jeffrey has your OODBMS that surfaces procedural
C#/.NET/LINQ as its native language, handles hierarchical data with the
greatest of ease, efficiently returns objects to the client without having
to deal with all those "squares", and automatically optimizes queries
without requiring you to define "indexes" or performing other administrative

Re: How costly is it to use BCP or OPENROWSET to create Excel file

s...@discussions.microsoft.com (Sam) — Fri, 11 Nov 2009 20:43:02 UT

Thank you both very much for your help. Been very helpful.

Re: Why can't recursive queries contain...?

jeff.williams3...@verizon.net (Jeffrey Williams) — Fri, 11 Nov 2009 20:26:24 UT

As I replied on another branch - I actually think his dream already exists.
I know that everything he is asking for is already available from
Intersystems Cache.

Re: Why can't recursive queries contain...?

jeff.williams3...@verizon.net (Jeffrey Williams) — Fri, 11 Nov 2009 20:24:33 UT

If you really think you want an OODBMS or Hierarchical DBMS which also has
capabilities to utilize SQL you might want to take a look at Intersystems
Cache. It does all of the above and is an Enterprise class system that can
also run on various hardware platforms.
You have the options of accessing data as objects, or running queries using

Re: How costly is it to use BCP or OPENROWSET to create Excel files?

ad...@geocodenet.com (Michael Coles) — Fri, 11 Nov 2009 19:39:59 UT

Agree with John, you probably want to use SSIS to export data directly to
Excel. As part of your SSIS package you can move the XLS file over to
another directory/server after the export.

Re: Why can't recursive queries contain...?

ad...@geocodenet.com (Michael Coles) — Fri, 11 Nov 2009 19:27:18 UT

Absolutely, and so do hierarchical DBMS's, which would solve his issues with
the limitations on hierarchical data inherent in the relational/SQL model.
I don't know why OODBMS's haven't caught on outside of specialized
applications either -- maybe they're inferior in some respects, could be an
issue of support, or it might just be good old-fashioned marketing? Either

Re: IDENTITY_INSERT

nospamagi...@newsgroup.nospam (AG) — Fri, 11 Nov 2009 19:21:25 UT

Thanks Tom. A big help as usual!