Partition Removal Query

Hello,
I currently use Parallels 4 for my Windows Vista needs (as they are quite minimal), but my workload that requires the use of the Office 2007 layout requires me to make a more drastic dedication to Windows, in short, I'm considering using the Boot Camp Assistant to use Windows Vista, but I had a few concerns:
-Once my work there is completed, and my need for such a partition isn't applicable, can the partition be removed, thus releasing that hard drive space for my Mac OS partition to utilize?
-The Assistant recommends that I back up prior to creating the partition (something I would've done anyway), but I was curious as to whether or not serious damage occurring is common when creating such a partition?
-I recently upgraded to Snow Leopard, so I don't know if this question is applicable or not: In previous versions, I was told, if I wanted to switch between the partitions, a reboot was required; is this still the case? Is there any way to keep my Mac partition running (applications, etc.) while using my Windows partition?
-I have very limited Hard drive space, and I've only allocated 10-15 GB for the Windows partition, will this space constraint inhibit performance drastically?
Thanks for any help you can give me.

Hi jmarhee,
Hello,
I currently use Parallels 4 for my Windows Vista needs (as they are quite minimal), but my workload that requires the use of the Office 2007 layout requires me to make a more drastic dedication to Windows, in short, I'm considering using the Boot Camp Assistant to use Windows Vista, but I had a few concerns:
-Once my work there is completed, and my need for such a partition isn't applicable, can the partition be removed, thus releasing that hard drive space for my Mac OS partition to utilize?
The BootCamp Assistant can repartition/delete the once made Windows partition completely and assign the disk space back to OSX.
-The Assistant recommends that I back up prior to creating the partition (something I would've done anyway), but I was curious as to whether or not serious damage occurring is common when creating such a partition?
I never had any problems with the making or deleting of a Windows partition while using the BootCamp Assistant.
Nonetheless I always had a backup of my OSX, since 'fumbling' with partition structures on a harddisk can cause disastreous results.
-I recently upgraded to Snow Leopard, so I don't know if this question is applicable or not: In previous versions, I was told, if I wanted to switch between the partitions, a reboot was required; is this still the case? Is there any way to keep my Mac partition running (applications, etc.) while using my Windows partition?
The useage of a BootCamp Windows always requires a reboot of the Mac, whether from OSX to Windows or from Windows to OSX.
The only way to run Windows alongside OSX is, as you know, the useage of Parallels or other virtualization apps.
-I have very limited Hard drive space, and I've only allocated 10-15 GB for the Windows partition, will this space constraint inhibit performance drastically?
10-15GB is merely the minimum for using Vista, thus leaving you with not enough disk space for using Office 2007.
Something about 25-35GB is what I would allocate as minimum for Vista with Office2007.
Thanks for any help you can give me.
Hope it helps
Stefan

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Hi,
Help to to form a query which displas the below result.
The continuous month in to_date & from_date must be removed. The is a gap between 29-Feb-2008 and 01-Apr-2008. so this is displayed as seperate row in the expected result.
Dataset
MBR_SID FROM_DATE     TO_DATE
00999     Jan-01-2008     Jan-31-2008
00999     Feb-01-2008     Feb-29-2008
00999     Apr-01-2008     Apr-30-2008
00999     May-01-2008     May-31-2008
00999     Jun-01-2008     Jun-30-2008
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MBR_SID FROM_DATE     TO_DATE
00999     Jan-01-2008     Feb-29-2008
00999     Apr-01-2008     Jun-30-2008
00888     Feb-01-2008     Feb-29-2008
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S. Sathish Kumar

Another solution
select mer_sid , min(FROM_DATE) FROM_DATE , max(TO_DATE) TO_DATE
from (select mer_sid,FROM_DATE,TO_DATE,next_date,grp
           from t
           model
           partition by (mer_sid)
          dimension by (row_number()over(partition by mer_sid order by FROM_DATE)   rn)
          measures( FROM_DATE,TO_DATE,lag(to_DATE)over(partition by mer_sid order by
                             from_date ) next_date, 1 grp,1 grpprec)
          rules
          upsert
          iterate (1000)
          until(presentv(FROM_DATE[iteration_number+2],1,0)=0)
          ( grpprec[any]=nvl(grp[cv()-1],1),
             grp[any]= case when nvl( next_date[cv()]+1,from_DATE[cv()]) =from_DATE[cv()] then
             grpprec[cv()] else grpprec[cv()]+1 end))
group by mer_sid ,grp
SQL> select * from t;
MER_S FROM_DATE TO_DATE
00999 01-JAN-08 31-JAN-08
00999 01-FEB-08 29-FEB-08
00999 01-APR-08 30-APR-08
00999 01-MAY-08 31-MAY-08
00999 01-JUN-08 30-JUN-08
00888 01-FEB-08 29-FEB-08
6 rows selected.
SQL> select mer_sid , min(FROM_DATE) FROM_DATE , max(TO_DATE) TO_DATE
2   from (select mer_sid,FROM_DATE,TO_DATE,next_date,grp
3             from t
4             model
5             partition by (mer_sid)
6            dimension by (row_number()over(partition by mer_sid order by FROM_DATE)   rn)
7            measures( FROM_DATE,TO_DATE,lag(to_DATE)over(partition by mer_sid order by
8                               from_date ) next_date, 1 grp,1 grpprec)
9            rules
10            upsert
11            iterate (1000)
12            until(presentv(FROM_DATE[iteration_number+2],1,0)=0)
13            ( grpprec[any]=nvl(grp[cv()-1],1),
14               grp[any]= case when nvl( next_date[cv()]+1,from_DATE[cv()]) =from_DATE[cv()] then
15               grpprec[cv()] else grpprec[cv()]+1 end))
16 group by mer_sid ,grp
17 /
MER_S FROM_DATE TO_DATE
00999 01-JAN-08 29-FEB-08
00999 01-APR-08 30-JUN-08
00888 01-FEB-08 29-FEB-08

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You should be fine with format/initialize or erase of the entire hard drive (top level name, something like vendor name WDxxxx or SExxxx for Western Digital etc).
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hi,
i have exceuted the query using PARTION BY using toad in oracle 9i database
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i think u r confuse with Analytical Functions Partition by thing.... Analytical functions are available since 8i
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FROM ...
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[My Oracle Blog|http://baigsorcl.blogspot.com/]

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Partition By Query Problem

Hi everyone,
I'm trying to print out for every 5 seconds; the average value of each stock's price for last 10 seconds. The query shoud look like this:
select price, avg(price) from stockInputChannel [partition by stockName range 10 slide 5]
BUT, OCEP's CQL does not suppport this kind of query. It warns me to use "partition by $partname rows $rownumber range $rangevalue slide $slidevalue". As I mentioned above I do not need row related query, parameter.. Why the CQL forces me to use that?
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Hi,
Peter is right. The best way to learn how a function works is to do some experiments. The SQL Languarge Reference manual describes all the built-in functions, including ROW_NUMBER, and has a good general description of how analytic functions in general work, under "Analytic functions".
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When you say "partition by customer_no", a separate set of numbers (starting with 1) will be used for each distinct value of customer_no.
When you say "order by customer_type desc,rowid desc", that means the lower numbers will be assigned to the higher values of customer_type. If there is a tie (two or more rows with exactly the same customer_type), then lower numbers will be assigned to the higher values of rowid.
In the main query, the WHERE clause includes only the rows that were assigned 1 by the ROW_NUMBER function. The result is get one row of dta for each customer_no (the PARTITION BY column). Which row will that be? The one with the highest customer_type (the ORDER BY column). This is called a Top-N Query, because you are picking N items (N=1 here) from the top of a sorted list. Notice that the analytic function is used in a sub-query, and its value is used in the WHERE clause of the main query. That's necessary, because analytic fucntions in a (sub)query are evaluated after the WHERE clause.

Partition by query

pls explain the below query concept with example.
select customer_no,address1
from
(select customer_no,address1,address2,city
row_number() over(partition by customer_no order by customer_type desc,rowid desc)rk
from xy where customer_no>100 and RK=1;
The customer_no is repeated more then one times in our table.

Hi,
Peter is right. The best way to learn how a function works is to do some experiments. The SQL Languarge Reference manual describes all the built-in functions, including ROW_NUMBER, and has a good general description of how analytic functions in general work, under "Analytic functions".
ROW_NUMBER assigns an integer 1, 2, 3, ... to each row.
When you say "partition by customer_no", a separate set of numbers (starting with 1) will be used for each distinct value of customer_no.
When you say "order by customer_type desc,rowid desc", that means the lower numbers will be assigned to the higher values of customer_type. If there is a tie (two or more rows with exactly the same customer_type), then lower numbers will be assigned to the higher values of rowid.
In the main query, the WHERE clause includes only the rows that were assigned 1 by the ROW_NUMBER function. The result is get one row of dta for each customer_no (the PARTITION BY column). Which row will that be? The one with the highest customer_type (the ORDER BY column). This is called a Top-N Query, because you are picking N items (N=1 here) from the top of a sorted list. Notice that the analytic function is used in a sub-query, and its value is used in the WHERE clause of the main query. That's necessary, because analytic fucntions in a (sub)query are evaluated after the WHERE clause.

Recovery partition removed

i want to restore my computer to it's factory system but when i open recovery manager , it tells me "recovery partition is removed "
what shall i do ??
my note book is : HP PAVILION DV6-6C40EE ENTERTAINMENT NOTEBOOK PC
windows : 7
and i don't have the steup CD for the windows

Hi,
You can order a replacement set of Recovery Discs using the link below - using these discs to reinstall the operating system will also re-create the Recovery Partition on the Hard Drive.
Order HP Recovery Discs.
If you have any problem with this link, order them directly from HP.
If you live in the US, contact HP Here.
If you are in another part of the world, start Here.
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

Windows 7 installation failure - Partition removal failure

Having an issue...
Have newish 27inch with latest SL build. Bootcamp 3.02. Tried to install Windows 7 (64 bit, which is probably the mistake). Made it most of the way through the installation process, then the screen started to hang for while... had no choice, had to reboot. Long story short, I eventually had to restart (hold option) to boot into OS, and then remove the partition. Problem is, even after I removed the partition from bootcamp, whenever I restart my machine, if I don't hold down option, it goes to a black screen looking for a bootable disk. It thinks it's still trying to boot to windows, even though the partition has been removed. Aside from blasting the OS away, any work arounds??
thanks much

Thanks for the info - forgot to check the start-up preferences...
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Convert SQL Server ROW_NUMBER() OVER(PARTITION BY() Query to Access

Hi,
I am having trouble with converting this SQL Server query to Access. If anyone can give me help I would appreciate it.
SELECT B.AMOUNT_REQUESTED, B.INIT_OFF, B.MBR_NBM, B.STATUS, B.APPLICATION_NBR
FROM
SELECT AMOUNT_REQUESTED, INIT_OFF, MBR_NBM, STATUS, APPLICATION_NBR, ROW_NUMBER() OVER(PARTITION BY MBR_NBM ORDER BY MBR_NBM) RN
FROM LOAN_DATA
WHERE APPLICATION_DATE BETWEEN '20150420' AND '20150425'
) B
WHERE RN = 1
ORDER BY B.MBR_NBM

While there is no equivalent to ROW_NUMBER(), it appears that you are just wanting the first row of each group, and that CAN be accomplished in Access, but I do wonder why you would WANT to do that in Access if your data is stored in SQL Server. As
Tom indicated a Pass Through query object is likely your best bet -- or a View in SQL Server, then create a Linked Table object that points to it.
To get the first of each group ... which is essentially a TOP n, where n = 1 ... so .. the first thing you will want to indentify is a second field to use as a Key in order to define the "first" row you want in the group. In your SQL
statement, you are ordering my mbr_nbm, so the secondary sort is unknown -- likely predicable, but unknown with out knowledge of the schema ... so, I will provide samples by using APPLICATION_DATE as the sort key.
This one is the "first" of a series with the assumption that the one you want is the one with the "biggest"/"most recent" APPLICATION_DATE.
SELECT vLoanData.AMOUNT_REQUESTED, vLoanData.INIT_OFF, vLoanData.MBR_NBM, vLoanData.STATUS, vLoanData.APPLICATION_NBR
FROM LOAN_DATA As vLoanData
INNER JOIN
(SELECT MBR_NBM, Max(APPLICATION_DATE) As LastAppDate
FROM LOAN_DATA As vLast
GROUP BY MBR_NBM) As vLastApp ON vLoanData.MBR_NBM = vLastApp.MBR_NBM And vLoadData.APPLICATION_DATE = vLastApp.LastAppDate
Or ... the following is a TOP n query where n = 1.
SELECT vLoanData.AMOUNT_REQUESTED, vLoanData.INIT_OFF, vLoanData.MBR_NBM, vLoanData.STATUS, vLoanData.APPLICATION_NBR
FROM LOAN_DATA As vLoanData
WHERE (vLoanData.MBR_NBM & '|' & vLoanData.APPLICATION_DATE)
IN (SELECT TOP 1 (vCorrelated.MBR_NBM & '|' & vCorrelated.APPLICATION_DATE) As Key
FROM LOAN_DATA As vCorrelated
WHERE vCorrelated.MBR_NBM = vLoanData.MBR_NBM
ORDER BY vCorrelated.MBR_NBM, vCorrelated.APPLICATION_DATE DESC)
This second example is not going to win you any points with respect to speed, but is truly a closer model to the TOP N type thing you are doing in SQL Server.
Hope that helps!
Brent Spaulding | Access MVP

Windows 7 partition removable?

Hello everyone,
i have been a windows guy for god knows how long, building pc's left right and centre, but i always wondered if the grass was greener on the other side.
So i have bit the bullet and brought myself a macbook pro.
I was completely unaware of how easy it is to run windows on a mac machine. however if i did run windows 7 through bootcamp and then decided i didnt need could i remove it and the partition and extend the original mac partition again to the full size of the hd?
If you could help it would be appreciated.

Yes. Use the Boot Camp Assistant to return the drive to a single partition setup.
(106827)

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While you are waiting on expert advice, I can give you non expert advice.
I used the recovery disks to load my SSD (120GB) and than deleted that partition since you only can create the recovery disks once. I recall that it was very easy to do. In fact I think the factory image is set up to do it automatically.
Now an expert could tell you how, I just can say that I googled removing it and did what was recommended and it was about a 2 step operation with no outside software needed.
Perry
Perry
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Partition removal

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Michael

Hi, Michael. There are several utilities that claim to be able to repartition an OS X drive without reformatting (and thus erasing) the drive. Of those, Drive Genius has been reported in these forums to work; I haven't seen any posts explicitly vouching for any of the others from personal experience.
More RAM and a larger, faster hard drive are the two most economical speed-boosting upgrades you can apply to a 2001 Tibook. If you still have a dinky 10GB or 20GB hard drive and less than 5GB of free space available on it, you need a larger drive even if you do add RAM. But if you have less than 512MB of RAM, boosting it to 512MB or more (the maximum is 1GB) should be your first investment.
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