Footer rows to skip: primary

Showing posts with label primary. Show all posts

Monday, March 26, 2012

Fetching Duplicate Rows

Hi,

I have some duplicate rows in a table. I didnt define any primary key or unique key on the table.

I can get unique rows using DISTINCT, but i want to fetch only the duplicated rows and also i want to delete the duplicated rows.

How can i do it?

Please help me....

Thanx in AdvanceI have some duplicate rows in a table. I didnt define any primary key or unique key on the table.

Can you paste some DDL. Are all the columns for the duplicated rows same ? Is there any date time stamp ? You could find some help Here (http://www.sqlteam.com/item.asp?ItemID=3331)|||Try something like:

Select * from Table
Where {Key Fields} IN
(select {key Fields} from Table
group by {Key Fields}
Having Count(*) >1)

Where Table is your Table/Query and {Key Fields} is the list of fields you want to search for duplicates on

HTH

Marp

[
QUOTE]Originally posted by d_kishan
Hi,

I have some duplicate rows in a table. I didnt define any primary key or unique key on the table.

I can get unique rows using DISTINCT, but i want to fetch only the duplicated rows and also i want to delete the duplicated rows.

How can i do it?

Please help me....

Thanx in Advance [/QUOTE]|||You say you want to delete the duplicated rows, but I bet what you really want is to delete all but one of each duplicated row. Your first step is to add a primary key. Otherwise, there is no way to discern which of the duplicated rows to retain and your only option will be to select DISTINCT into a new table and then replace your old table.|||If you want to know how many duplicate rows you have per your Key criteria,

do this

[Select Key1,Key2,..Keyn, count(*)
from Table
group by {Key1,Key2,...Keyn}
Having Count(*) >1)

Fetch last record in a table

HI ALL,
Suppose i did not use identity for generating sequence in a
table.Also there is no sequence no column or no primary key on a
column. Then how to find last record in a table. Suppose there are 10
rows. How can i fetch 10th rows record.
Define your SQL SELECT statement , and THEN use ORDER BY myCol DESC -
select TOP 1. That's assuming there are 10 records.
If there are more than 10 records , and you are using SQL 2005 , you could
do something like:
SELECT col1, col2, ROW_NUMBER() OVER (ORDER BY Col2 DESC)AS RowFROm
myTableWHERE Row = 10
Jack Vamvas
___________________________________
Search IT jobs from multiple sources- http://www.ITjobfeed.com
"mohit" <goenka.mohit@.gmail.com> wrote in message
news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> HI ALL,
> Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.
|||On Jan 16, 2:50Xpm, "MC" <markoDOTculo@.gmailDOTcom> wrote:
> First you need to define 10th. What does it mean exactly? Last fetched, last
> by some value, last..... Without primary key you basically dont have a
> consistent approach, so some kind of definition is definitely needed here.
> MC
> "mohit" <goenka.mo...@.gmail.com> wrote in message
> news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
>
>
> - Show quoted text -
HI,
10th means last record. Without primary key there is no consitent
approach but suppose we dont have then how we will find.
|||MC
SELECT TOP 1 col FROM tbl ORDER BY whatever DESC
"MC" <markoDOTculo@.gmailDOTcom> wrote in message
news:5C08A997-8EFD-4C5B-96FD-AC49EFC9DFB6@.microsoft.com...
> First you need to define 10th. What does it mean exactly? Last fetched,
> last by some value, last..... Without primary key you basically dont have
> a consistent approach, so some kind of definition is definitely needed
> here.
>
> MC
>
> "mohit" <goenka.mohit@.gmail.com> wrote in message
> news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
>
|||On Jan 16, 3:22Xpm, mohit <goenka.mo...@.gmail.com> wrote:
> HI ALL,
> X X X Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.
In a set there is no such thing as last record.
|||On Jan 16, 3:22Xpm, "Uri Dimant" <u...@.iscar.co.il> wrote:
> MC
> SELECT TOP 1 col FROM tbl ORDER BY whatever DESC
> "MC" <markoDOTculo@.gmailDOTcom> wrote in message
> news:5C08A997-8EFD-4C5B-96FD-AC49EFC9DFB6@.microsoft.com...
>
>
>
> - Show quoted text -
Hi,
Sorry yaar but its not working. When we do order by col_name desc
the rows gets shuffle due to which answer is coming wrong
|||On Jan 16, 3:28Xpm, SB <othell...@.yahoo.com> wrote:
> On Jan 16, 3:22Xpm, mohit <goenka.mo...@.gmail.com> wrote:
>
> In a set there is no such thing as last record.
Can you tell what set means. i am asking from table how to fetch last
record i.e last row from a table
|||On Jan 16, 4:45Xpm, mohit <goenka.mo...@.gmail.com> wrote:
> On Jan 16, 3:28Xpm, SB <othell...@.yahoo.com> wrote:
>
>
> Can you tell what set means. i am asking from table how to fetch last
> record i.e last row from a table
A table consists of a set of records. It is not a sequence so that you
have first or last record. A set is an unordered set of records.
|||> Sorry yaar but its not working. When we do order by col_name desc
> the rows gets shuffle due to which answer is coming wrong
How do you know it is not working if there is no data in the row to identify
the order of insertion?
An important relational database concept is that a table is an unordered set
of rows. Rows may be returned in an arbitrary sequence unless you specify
ORDER BY. If you want data returned in the sequence in which rows were
inserted, you'll need an incrementing column like inserted datetime or
identity for the ordering.
Hope this helps.
Dan Guzman
SQL Server MVP
"mohit" <goenka.mohit@.gmail.com> wrote in message
news:d4d2d6c5-c6e0-4612-9f57-13accf2ff8b1@.i7g2000prf.googlegroups.com...
On Jan 16, 3:22 pm, "Uri Dimant" <u...@.iscar.co.il> wrote:
> MC
> SELECT TOP 1 col FROM tbl ORDER BY whatever DESC
> "MC" <markoDOTculo@.gmailDOTcom> wrote in message
> news:5C08A997-8EFD-4C5B-96FD-AC49EFC9DFB6@.microsoft.com...
>
>
>
> - Show quoted text -
Hi,
Sorry yaar but its not working. When we do order by col_name desc
the rows gets shuffle due to which answer is coming wrong
|||"mohit" <goenka.mohit@.gmail.com> wrote in message
news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> HI ALL,
> Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.
As others have said, w/o a primary key, there's no such thing as a "last
record" defined.
And in fact, without an ORDER BY you can never guarantee the order you'll
return the data in.
SELECT * from FOO may in fact return a different order of results at
different times.
This could be due to what's in the memory cache at the time, if the engine
decides to parallize the query across different CPUs, etc.
Now, MOST LIKELY for 10 rows, a simple "select * from FOO" will return the
data in the order it was inserted but that's absolutely no guarantee this is
true.
You may want to google the definition of a "SET" or "TABLE" within SQL.
They have no inherent order.
So sorry to say, you probably can't get the answer to the question you seek
(at least not the way it's posed.)
Greg Moore
SQL Server DBA Consulting Remote and Onsite available!
Email: sql (at) greenms.com http://www.greenms.com/sqlserver.html
sql

Fetch last record in a table

HI ALL,
Suppose i did not use identity for generating sequence in a
table.Also there is no sequence no column or no primary key on a
column. Then how to find last record in a table. Suppose there are 10
rows. How can i fetch 10th rows record.First you need to define 10th. What does it mean exactly? Last fetched, last
by some value, last..... Without primary key you basically dont have a
consistent approach, so some kind of definition is definitely needed here.
MC
"mohit" <goenka.mohit@.gmail.com> wrote in message
news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> HI ALL,
> Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.|||Define your SQL SELECT statement , and THEN use ORDER BY myCol DESC -
select TOP 1. That's assuming there are 10 records.
If there are more than 10 records , and you are using SQL 2005 , you could
do something like:
SELECT col1, col2, ROW_NUMBER() OVER (ORDER BY Col2 DESC)AS RowFROm
myTableWHERE Row = 10
Jack Vamvas
___________________________________
Search IT jobs from multiple sources- http://www.ITjobfeed.com
"mohit" <goenka.mohit@.gmail.com> wrote in message
news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> HI ALL,
> Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.|||On Jan 16, 2:50=A0pm, "MC" <markoDOTculo@.gmailDOTcom> wrote:
> First you need to define 10th. What does it mean exactly? Last fetched, la=st
> by some value, last..... Without primary key you basically dont have a
> consistent approach, so some kind of definition is definitely needed here.=
> MC
> "mohit" <goenka.mo...@.gmail.com> wrote in message
> news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
>
> > HI ALL,
> > =A0 =A0 =A0Suppose i did not use identity for generating sequence in a
> > table.Also there is no sequence no column or no primary key on a
> > column. Then how to find last record in a table. Suppose there are 10
> > rows. How can i fetch 10th rows record.- Hide quoted text -
> - Show quoted text -
HI,
10th means last record. Without primary key there is no consitent
approach but suppose we dont have then how we will find.|||MC
SELECT TOP 1 col FROM tbl ORDER BY whatever DESC
"MC" <markoDOTculo@.gmailDOTcom> wrote in message
news:5C08A997-8EFD-4C5B-96FD-AC49EFC9DFB6@.microsoft.com...
> First you need to define 10th. What does it mean exactly? Last fetched,
> last by some value, last..... Without primary key you basically dont have
> a consistent approach, so some kind of definition is definitely needed
> here.
>
> MC
>
> "mohit" <goenka.mohit@.gmail.com> wrote in message
> news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
>> HI ALL,
>> Suppose i did not use identity for generating sequence in a
>> table.Also there is no sequence no column or no primary key on a
>> column. Then how to find last record in a table. Suppose there are 10
>> rows. How can i fetch 10th rows record.
>|||On Jan 16, 3:22=A0pm, mohit <goenka.mo...@.gmail.com> wrote:
> HI ALL,
> =A0 =A0 =A0 Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.
In a set there is no such thing as last record.|||On Jan 16, 3:22=A0pm, "Uri Dimant" <u...@.iscar.co.il> wrote:
> MC
> SELECT TOP 1 col FROM tbl ORDER BY whatever DESC
> "MC" <markoDOTculo@.gmailDOTcom> wrote in message
> news:5C08A997-8EFD-4C5B-96FD-AC49EFC9DFB6@.microsoft.com...
>
> > First you need to define 10th. What does it mean exactly? Last fetched,
> > last by some value, last..... Without primary key you basically dont ha=ve
> > a consistent approach, so some kind of definition is definitely needed
> > here.
> > MC
> > "mohit" <goenka.mo...@.gmail.com> wrote in message
> >news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> >> HI ALL,
> >> =A0 =A0 =A0Suppose i did not use identity for generating sequence in a
> >> table.Also there is no sequence no column or no primary key on a
> >> column. Then how to find last record in a table. Suppose there are 10
> >> rows. How can i fetch 10th rows record.- Hide quoted text -
> - Show quoted text -
Hi,
Sorry yaar but its not working. When we do order by col_name desc
the rows gets shuffle due to which answer is coming wrong|||On Jan 16, 3:28=A0pm, SB <othell...@.yahoo.com> wrote:
> On Jan 16, 3:22=A0pm, mohit <goenka.mo...@.gmail.com> wrote:
> > HI ALL,
> > =A0 =A0 =A0 Suppose i did not use identity for generating sequence in a
> > table.Also there is no sequence no column or no primary key on a
> > column. Then how to find last record in a table. Suppose there are 10
> > rows. How can i fetch 10th rows record.
> In a set there is no such thing as last record.
Can you tell what set means. i am asking from table how to fetch last
record i.e last row from a table|||On Jan 16, 4:45=A0pm, mohit <goenka.mo...@.gmail.com> wrote:
> On Jan 16, 3:28=A0pm, SB <othell...@.yahoo.com> wrote:
> > On Jan 16, 3:22=A0pm, mohit <goenka.mo...@.gmail.com> wrote:
> > > HI ALL,
> > > =A0 =A0 =A0 Suppose i did not use identity for generating sequence in =a
> > > table.Also there is no sequence no column or no primary key on a
> > > column. Then how to find last record in a table. Suppose there are 10
> > > rows. How can i fetch 10th rows record.
> > In a set there is no such thing as last record.
> Can you tell what set means. i am asking from table how to fetch last
> record i.e last row from a table
A table consists of a set of records. It is not a sequence so that you
have first or last record. A set is an unordered set of records.|||If the 'last' you mean last added then you need a column which will define
sequence of insertions. Something like 'DateAdded' or something like that.
Otherwise, you need to specify how do YOU know which record is 'last' when
you open sample data from table.
MC
"mohit" <goenka.mohit@.gmail.com> wrote in message
news:a53c73e5-4685-4d12-8f94-5e8a1b94b5b8@.f10g2000hsf.googlegroups.com...
On Jan 16, 2:50 pm, "MC" <markoDOTculo@.gmailDOTcom> wrote:
> First you need to define 10th. What does it mean exactly? Last fetched,
> last
> by some value, last..... Without primary key you basically dont have a
> consistent approach, so some kind of definition is definitely needed here.
> MC
> "mohit" <goenka.mo...@.gmail.com> wrote in message
> news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
>
> > HI ALL,
> > Suppose i did not use identity for generating sequence in a
> > table.Also there is no sequence no column or no primary key on a
> > column. Then how to find last record in a table. Suppose there are 10
> > rows. How can i fetch 10th rows record.- Hide quoted text -
> - Show quoted text -
HI,
10th means last record. Without primary key there is no consitent
approach but suppose we dont have then how we will find.|||> Sorry yaar but its not working. When we do order by col_name desc
> the rows gets shuffle due to which answer is coming wrong
How do you know it is not working if there is no data in the row to identify
the order of insertion?
An important relational database concept is that a table is an unordered set
of rows. Rows may be returned in an arbitrary sequence unless you specify
ORDER BY. If you want data returned in the sequence in which rows were
inserted, you'll need an incrementing column like inserted datetime or
identity for the ordering.
--
Hope this helps.
Dan Guzman
SQL Server MVP
"mohit" <goenka.mohit@.gmail.com> wrote in message
news:d4d2d6c5-c6e0-4612-9f57-13accf2ff8b1@.i7g2000prf.googlegroups.com...
On Jan 16, 3:22 pm, "Uri Dimant" <u...@.iscar.co.il> wrote:
> MC
> SELECT TOP 1 col FROM tbl ORDER BY whatever DESC
> "MC" <markoDOTculo@.gmailDOTcom> wrote in message
> news:5C08A997-8EFD-4C5B-96FD-AC49EFC9DFB6@.microsoft.com...
>
> > First you need to define 10th. What does it mean exactly? Last fetched,
> > last by some value, last..... Without primary key you basically dont
> > have
> > a consistent approach, so some kind of definition is definitely needed
> > here.
> > MC
> > "mohit" <goenka.mo...@.gmail.com> wrote in message
> >news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> >> HI ALL,
> >> Suppose i did not use identity for generating sequence in a
> >> table.Also there is no sequence no column or no primary key on a
> >> column. Then how to find last record in a table. Suppose there are 10
> >> rows. How can i fetch 10th rows record.- Hide quoted text -
> - Show quoted text -
Hi,
Sorry yaar but its not working. When we do order by col_name desc
the rows gets shuffle due to which answer is coming wrong|||"mohit" <goenka.mohit@.gmail.com> wrote in message
news:7d4851f9-331b-431d-a352-c8c5d634bf95@.f3g2000hsg.googlegroups.com...
> HI ALL,
> Suppose i did not use identity for generating sequence in a
> table.Also there is no sequence no column or no primary key on a
> column. Then how to find last record in a table. Suppose there are 10
> rows. How can i fetch 10th rows record.
As others have said, w/o a primary key, there's no such thing as a "last
record" defined.
And in fact, without an ORDER BY you can never guarantee the order you'll
return the data in.
SELECT * from FOO may in fact return a different order of results at
different times.
This could be due to what's in the memory cache at the time, if the engine
decides to parallize the query across different CPUs, etc.
Now, MOST LIKELY for 10 rows, a simple "select * from FOO" will return the
data in the order it was inserted but that's absolutely no guarantee this is
true.
You may want to google the definition of a "SET" or "TABLE" within SQL.
They have no inherent order.
So sorry to say, you probably can't get the answer to the question you seek
(at least not the way it's posed.)
Greg Moore
SQL Server DBA Consulting Remote and Onsite available!
Email: sql (at) greenms.com http://www.greenms.com/sqlserver.html|||>>
10th means last record. Without primary key there is no consitent
approach but suppose we dont have then how we will find.
If you don't have a column that can tell you what "last" means, then you
could return ANY row and how would you know it wasn't the "last" row?
In SQL Server, a table is an unordered set of rows by definition. If you
say SELECT TOP 1 columns FROM table or SELECT TOP 10 columns FROM table and
you don't include an ORDER BY clause, the optimizer is free to return
whichever rows it wants... and it can change its mind when you run the query
again 5 minutes later, giving you a different set. So, if you want to
identify your "last" row, you will need to have a column that you can use to
tell SQL Server "use this column to determine last."
A

Wednesday, March 7, 2012

Fast Sequencing

I have a table that I am trying to bulk load 100K records via SQL. The table
has a primary key of ID and SubID. I am creating a temporary table that will
populate ID just fine, but is there a fast way I can run through these
records and assign the SubID. I have no problem doing this in VB (it runs in
2 min) , but when I try doing this in SQL using a cursor it takes hours.
The net effect is as follows.
ID, SubID
1001, 1
1001, 2
1001, 3
1002, 1
1003, 1
1003, 2
1003, 3
TIA
RobRob Diamant wrote:
> I have a table that I am trying to bulk load 100K records via SQL.
> The table has a primary key of ID and SubID. I am creating a
> temporary table that will populate ID just fine, but is there a fast
> way I can run through these records and assign the SubID. I have no
> problem doing this in VB (it runs in 2 min) , but when I try doing
> this in SQL using a cursor it takes hours.
> The net effect is as follows.
> ID, SubID
> 1001, 1
> 1001, 2
> 1001, 3
> 1002, 1
> 1003, 1
> 1003, 2
> 1003, 3
> TIA
> Rob
Cursors are slow because they are not set-based. Do it in your
application and then bulk-load the data. I don't how we would know how
to help you assign a sub id since we don't know anything about your
requirements. Are you saying the SubID values do not exist in the file?
If so, how do you know how to assign them? How do you assign the IDs for
that matter?
--
David Gugick
Imceda Software
www.imceda.com|||David,
Thanks for the info. I already can sequence the SubID's in my application. I
am trying to find a way to cheat (ie faster) by using SQL.
In a related topic is there a way to get the select the ROWID?
Rob
"David Gugick" <davidg-nospam@.imceda.com> wrote in message
news:OievhCz$EHA.464@.tk2msftngp13.phx.gbl...
> Rob Diamant wrote:
>> I have a table that I am trying to bulk load 100K records via SQL.
>> The table has a primary key of ID and SubID. I am creating a
>> temporary table that will populate ID just fine, but is there a fast
>> way I can run through these records and assign the SubID. I have no
>> problem doing this in VB (it runs in 2 min) , but when I try doing
>> this in SQL using a cursor it takes hours.
>> The net effect is as follows.
>> ID, SubID
>> 1001, 1
>> 1001, 2
>> 1001, 3
>> 1002, 1
>> 1003, 1
>> 1003, 2
>> 1003, 3
>> TIA
>> Rob
> Cursors are slow because they are not set-based. Do it in your application
> and then bulk-load the data. I don't how we would know how to help you
> assign a sub id since we don't know anything about your requirements. Are
> you saying the SubID values do not exist in the file? If so, how do you
> know how to assign them? How do you assign the IDs for that matter?
> --
> David Gugick
> Imceda Software
> www.imceda.com|||Rob Diamant wrote:
> David,
> Thanks for the info. I already can sequence the SubID's in my
> application. I am trying to find a way to cheat (ie faster) by using
> SQL.
> In a related topic is there a way to get the select the ROWID?
> Rob
>
What is the ROWID as you mean it? Rows in SQL Server do not have ROW IDs
like they do in Oracle. If you just wanted an incremental ID, you could
use an IDENTITY column, and SQL Server would create the value for you.
But it appears from your sample data that your PK is the ID + SUBID. I
think adding the necesssary IDs in your application is the best option
based on the information you provided.
--
David Gugick
Imceda Software
www.imceda.com|||I don't know if this will be faster than assigning the SubID values in your
app but the example below shows how you can accomplish the task using a
set-based technique.
CREATE TABLE MyTable
(
ID int NOT NULL,
SubID int NOT NULL,
CONSTRAINT PK_MyTable PRIMARY KEY(ID, SubID)
)
CREATE TABLE MyStagingTable
(
SequenceNumber int IDENTITY(1, 1) NOT NULL
CONSTRAINT PK_MyStagingTable PRIMARY KEY,
ID int NOT NULL
)
INSERT INTO MyStagingTable
SELECT 1001
UNION ALL SELECT 1001
UNION ALL SELECT 1001
UNION ALL SELECT 1002
UNION ALL SELECT 1003
UNION ALL SELECT 1003
UNION ALL SELECT 1003
CREATE UNIQUE NONCLUSTERED INDEX Index1 ON MyStagingTable(ID,
SequenceNumber)
INSERT INTO MyTable
SELECT ID,
(SELECT COUNT(*)
FROM MyStagingTable b
WHERE b.ID = a.ID AND
a.SequenceNumber <= b.SequenceNumber)
FROM MyStagingTable a
--
Hope this helps.
Dan Guzman
SQL Server MVP
"Rob Diamant" <rob@.usi.com> wrote in message
news:uw30Mnz$EHA.612@.TK2MSFTNGP09.phx.gbl...
> David,
> Thanks for the info. I already can sequence the SubID's in my application.
> I am trying to find a way to cheat (ie faster) by using SQL.
> In a related topic is there a way to get the select the ROWID?
> Rob
>
> "David Gugick" <davidg-nospam@.imceda.com> wrote in message
> news:OievhCz$EHA.464@.tk2msftngp13.phx.gbl...
>> Rob Diamant wrote:
>> I have a table that I am trying to bulk load 100K records via SQL.
>> The table has a primary key of ID and SubID. I am creating a
>> temporary table that will populate ID just fine, but is there a fast
>> way I can run through these records and assign the SubID. I have no
>> problem doing this in VB (it runs in 2 min) , but when I try doing
>> this in SQL using a cursor it takes hours.
>> The net effect is as follows.
>> ID, SubID
>> 1001, 1
>> 1001, 2
>> 1001, 3
>> 1002, 1
>> 1003, 1
>> 1003, 2
>> 1003, 3
>> TIA
>> Rob
>> Cursors are slow because they are not set-based. Do it in your
>> application and then bulk-load the data. I don't how we would know how to
>> help you assign a sub id since we don't know anything about your
>> requirements. Are you saying the SubID values do not exist in the file?
>> If so, how do you know how to assign them? How do you assign the IDs for
>> that matter?
>> --
>> David Gugick
>> Imceda Software
>> www.imceda.com
>|||Dan,
Thanks, this should give me a great start.
Rob
"Dan Guzman" <guzmanda@.nospam-online.sbcglobal.net> wrote in message
news:uJEdf91$EHA.2676@.TK2MSFTNGP12.phx.gbl...
>I don't know if this will be faster than assigning the SubID values in your
>app but the example below shows how you can accomplish the task using a
>set-based technique.
> CREATE TABLE MyTable
> (
> ID int NOT NULL,
> SubID int NOT NULL,
> CONSTRAINT PK_MyTable PRIMARY KEY(ID, SubID)
> )
> CREATE TABLE MyStagingTable
> (
> SequenceNumber int IDENTITY(1, 1) NOT NULL
> CONSTRAINT PK_MyStagingTable PRIMARY KEY,
> ID int NOT NULL
> )
> INSERT INTO MyStagingTable
> SELECT 1001
> UNION ALL SELECT 1001
> UNION ALL SELECT 1001
> UNION ALL SELECT 1002
> UNION ALL SELECT 1003
> UNION ALL SELECT 1003
> UNION ALL SELECT 1003
> CREATE UNIQUE NONCLUSTERED INDEX Index1 ON MyStagingTable(ID,
> SequenceNumber)
> INSERT INTO MyTable
> SELECT ID,
> (SELECT COUNT(*)
> FROM MyStagingTable b
> WHERE b.ID = a.ID AND
> a.SequenceNumber <= b.SequenceNumber)
> FROM MyStagingTable a
> --
> Hope this helps.
> Dan Guzman
> SQL Server MVP
> "Rob Diamant" <rob@.usi.com> wrote in message
> news:uw30Mnz$EHA.612@.TK2MSFTNGP09.phx.gbl...
>> David,
>> Thanks for the info. I already can sequence the SubID's in my
>> application. I am trying to find a way to cheat (ie faster) by using SQL.
>> In a related topic is there a way to get the select the ROWID?
>> Rob
>>
>> "David Gugick" <davidg-nospam@.imceda.com> wrote in message
>> news:OievhCz$EHA.464@.tk2msftngp13.phx.gbl...
>> Rob Diamant wrote:
>> I have a table that I am trying to bulk load 100K records via SQL.
>> The table has a primary key of ID and SubID. I am creating a
>> temporary table that will populate ID just fine, but is there a fast
>> way I can run through these records and assign the SubID. I have no
>> problem doing this in VB (it runs in 2 min) , but when I try doing
>> this in SQL using a cursor it takes hours.
>> The net effect is as follows.
>> ID, SubID
>> 1001, 1
>> 1001, 2
>> 1001, 3
>> 1002, 1
>> 1003, 1
>> 1003, 2
>> 1003, 3
>> TIA
>> Rob
>> Cursors are slow because they are not set-based. Do it in your
>> application and then bulk-load the data. I don't how we would know how
>> to help you assign a sub id since we don't know anything about your
>> requirements. Are you saying the SubID values do not exist in the file?
>> If so, how do you know how to assign them? How do you assign the IDs for
>> that matter?
>> --
>> David Gugick
>> Imceda Software
>> www.imceda.com
>>
>

Monday, March 26, 2012

Fetching Duplicate Rows

Fetch last record in a table

Fetch last record in a table

Wednesday, March 7, 2012

Fast Sequencing

Fast Sequencing

Fast Sequencing

Footer rows to skip

Blog Archive

About Me