Copy Values From Previous Row

Aug 26, 2006

I'm guessing this is a fairly straight forward need, but want to make sure I am using the correct set of tasks:

In the dataflow, some values I need to carry forward from the previous row, such as a balance that I need to carry forward for the current customer record. This is similar to a running total, only I am not summing anything, but just carrying over from the previous records value (assuming dataset is sorted correctly, first by customer #, then by date).

Do I need the Dervied Column transform, and use a variable to store the previous value, or is there another transform that would be better suited?

Thanks

Kory

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Transact SQL :: Copy Previous Non Null Value

Aug 10, 2015

I have a table with data like below

SampleDateTime Value

2015-08-08 01:00 AM 0.5
2015-08-08 02:00 AM Null
2015-08-08 03:00 AM Null
2015-08-08 04:00 AM Null

[code]....

Using subquery I thought of a couple of ways but that didn't work.

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Select - Copy Field Content From Previous Row?

Aug 12, 2014

I have 1 table with some empty product codes that I have imported from a txt file. And I would like to fill in the empty product codes by taking the previous product code

date product_code
01/01/14 | BIC01 |
03/01/14 | |
01/01/14 | CASH |
04/01/14 | BIC01 |
02/01/14 | CASH |
05/01/14 | |
03/01/14 | CASH |

I though of using the LAG function but the table does not have any specific order.So after running the select, the table should look like:

date product_code
01/01/14 | BIC01 |
03/01/14 | BIC01 |
01/01/14 | CASH |
04/01/14 | BIC01 |
02/01/14 | CASH |
05/01/14 | CASH |
03/01/14 | CASH |

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How To Sum Previous Row Values?

May 15, 2008

Hi,

I need your help for my SQL query. I have a table like this

ClmA ClmB ClmType
------+------+----------
1 | 10 | 0
2 | 20 | 0
3 | 30 | 1
4 | 40 | 0
5 | 50 | 1

And its the result that i want to get.

ClmA ClmB ClmType ClmResult
------+------+---------+-------
1 | 10 | 0 | 10
2 | 20 | 0 | 30
3 | 30 | 1 | 30
4 | 40 | 0 | 70
5 | 50 | 1 | 80


Let me explain. When retrieving a row, an extra column should be added.It's value should be the sum of previous rows whose type is the same with the encountered one. I made it with a function but it's performance was terible with large tables. I have tables larger then fifty housands rows.

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Getting Previous Values Of A Field

Mar 15, 2006

Hi,In oracle I have a LAG function using which I could get the previousvalue of a field.Do we have anything similar to that in SQL Server or access?ThanksDevi

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Most Effecient Way To Get Previous Row Values?

Jan 23, 2007

Wow, this board has gotten really busy lately - maybe 2007 is the year that a lot more people start using SSIS :)

Anyway my question is this: If I have an ordered set of data in the data flow and I want to add a column, lets just say "previousID" that basically has the ID value of a column from the row immediately before it - what is the most effecient way of doing that?

I've done much more complicated things with running averages, mean, etc by creating an asynchronous script transformation, pushing the data into a datatable in memory and looping through row by row using variables etc to do the calcs... but I just have this feeling that there is a "lighter, faster, easier" way for just getting previous row's value (with some special rows like first row has a null etc) than looping through a datatable row by row.

Can you push the buffer into an array (if so anyone have an example script) and use simple "n-1" logic? (ie using the array index)

 

 

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Average Of Previous Values

May 9, 2008


How to write Stored Procedure to convert All seconds to Minutes AND finding average.

Ex:

My Table1:

SYMBOL TIME PRICE

EUR A0-FX 2008-05-09 11:37:31.203 1.54035
EUR A0-FX 2008-05-09 11:37:30.030 1.54034
EUR A0-FX 2008-05-09 11:37:28.860 1.54033
EUR A0-FX 2008-05-09 11:37:41.673 1.54032
EUR A0-FX 2008-05-09 11:37:59.720 1.54031

EUR A0-FX 2008-05-09 11:38:09.000 1.54033
EUR A0-FX 2008-05-09 11:38:35.877 1.54032
EUR A0-FX 2008-05-09 11:38:59.767 1.54041


OutPut:

SYMBOL TIME PRICE

EUR A0-FX 11:37 1.54031
EUR A0-FX 11:38 1.54041

I know this how to write ..




;WITH cte
AS
(
SELECT
SYMBOL,
[Time],
Price,
ROW_NUMBER() OVER(PARTITION BY CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) ORDER BY CAST(Time AS DATETIME) ASC) AS rn_1,
ROW_NUMBER() OVER(PARTITION BY CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) ORDER BY CAST(Time AS DATETIME) DESC) AS rn_2
FROM
Table1 WHERE SYMBOL='EUR A0-FX'
)

SELECT SYMBOL='EUR A0-FX',CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) AS [Time],MAX(CASE WHEN rn_2 = 1 THEN Price ELSE NULL END) AS [Close] FROM cte

GROUP BY
CONVERT(CHAR(5), CAST(Time AS DATETIME), 114)
ORDER BY
CAST(CONVERT(CHAR(5), CAST(Time AS DATETIME), 114) AS DATETIME);



But I want to add some additional code in my procedure like AVERAGE of Previous 5 Price Values.

Ex:

SYMBOL TIME PRICE

EUR A0-FX 11:37 1.54031 ß1
EUR A0-FX 11:38 1.54041 ß2
EUR A0-FX 11:39 1.54021 ß3
EUR A0-FX 11:40 1.54081 ß4
EUR A0-FX 11:41 1.54071 ß5 Previous 5 Average PRICE Values.
(1.54061)

EUR A0-FX 11:42 1.54091 ß6
EUR A0-FX 11:43 1.54021 ß7
EUR A0-FX 11:44 1.54081 ß8


My Final
Out Put:

SYMBOL TIME PRICE AVERAGE
EUR A0-FX 11:42 1.54091 ß6 (1.54061)
EUR A0-FX 11:43 1.54021 ß7 (1.54091)
EUR A0-FX 11:44 1.54081 ß8 (1.54071)

At 11.42 time average is 1-5 price values
At 11.43 time average is 2-6 price values
At 11.44 time average is 3-7 price values


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T-SQL (SS2K8) :: Set Current Row Using Values In Previous Row

Feb 25, 2015

I've tried all sorts of code i.e. cross apply, running totals, etc. Cannot get this to work. I am trying to add a previous row value but only doing it for each group.

Source records
DECLARE @tbl table (Item int, Sequence int, StartTime datetime, Duration int)
INSERT INTO @tbl (Item,Sequence,StartTime, Duration) VALUES (1,1,'2/25/2015 12:00 am',10),(1,2,null,20),(1,3, null,22),(2,1,'2/25/2015 1:00 am',15),(2,2,null,30),(2,3, null,45),(2,4, null,5)
select * from @tbl

ItemSequenceStartTimeDuration
1102/25/15 0:0010
12null 20
13null 22
2102/25/15 1:0015
22null 30
23null 45
2 4 null 5

I would like to set the start time of the next row to be equal to the previous row time + duration. I know the start time of each group of 'Items' when the 'Sequence' number = 1. The last 'duration' value in the group would be ignored.

My expected output would be:

ItemSequenceStartTimeDuration
1102/25/15 0:0010
1202/25/15 0:1020
1302/25/15 0:3022
2102/25/15 1:0015
2202/25/15 1:1530
2302/25/15 1:4545
2402/25/15 2:305

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How To Check Previous And Next Record Values

May 22, 2008

Hi all,

I wanted to check the previous and next record values.

For example:

sKey NextKey PreviousKey

1 2 Null
2 8 1
8 5 2
5 null 8

I wanted to check the value of NextKey of Prev record and Skey of Next record.

Any idea?

Regards
Helen

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Fast Way To Get Values From Previous Record

Jul 20, 2005

Hello,I know that I've seen this question asked on here before, but I can'tfind an answer that gives me the performance that I need.I have a table that stores events for users:CREATE TABLE Lead_Action_History (lead_action_seq INT IDENTITY NOT NULL,lead_action_date DATETIME NOT NULL,lead_seq INT NULL,operator_id VARCHAR(20) NOT NULL,call_time INT NOT NULL,CONSTRAINT PK_Lead_Action_History PRIMARY KEY (lead_action_seq) )GOThe table has a foreign key to another table through the lead_seqcolumn:CREATE TABLE Lead_Master (lead_seq INT IDENTITY NOT NULL,state CHAR(2) NOT NULL,CONSTRAINT PK_Lead_Master PRIMARY KEY (lead_seq) )GOI need to write a query that will give me a sum of call_time brokendown by a column that is in the table joined through the lead_seq.However, if the lead_seq for a row is NULL then I need to use thelead_seq for the previous row (based on lead_action_date) for the sameoperator.This is what I came up with:SELECT LM.state, SUM(call_time)FROM Lead_Action_History LAHINNER JOIN Lead_Master LM ON (LM.lead_seq = LAH.lead_seq)OR (LAH.lead_seq IS NULLAND LM.lead_seq = (SELECT TOP 1LAH2.lead_seqFROMLead_Action_History LAH2WHERELAH2.operator_id = LAH.operator_idAND LAH2.lead_seqIS NOT NULLORDER BYLAH2.lead_action_date DESC))GROUP BY LM.stateThe problem is that Lead_Action_History has millions of records andany solution that I've found involves one or more subqueries on itwhich kills performance. I am going to look at using a covering indexwith the solution above, but I thought that someone here might haveanother way of doing this.I can't really change the structure, but I can play with the indexing.I would still be curious though how other people model this type oftemporal data in a way that makes it easy to work with.Thanks!-Tom.

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How To Check Previous And Next Record Values

May 22, 2008

Hi all,

I wanted to check the previous and next record values.

For example:

sKey NextKey PreviousKey

1 2 Null
2 8 1
8 5 2
5 null 8


Ex : In the first record of the table, the NextKey is pointing to 2.
So the next record of Skey will be 2. The Next Key for this record is 8. Like wise the next record of this should have the Skey as 8.

Now I need to check whether the NextKey and SKey are correct for all rows.

For that I need to check the previous record of "Next key" and next record of "Skey".

Any idea?

Regards
Helen

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Jan 7, 2014

CREATE TABLE #MyTable
(
Teams VARCHAR(10),
StartDate DATETIME,
Count INT
)
INSERT INTO #MyTable (Teams,StartDate,Count)
SELECT 'Team A', '01/01/2014',10

[Code] ....

'Team A' Has No records for '01/02/2014' and '01/03/2014' so I need to insert values of '01/01/2014' StartDate for Team A for the missing dates

So 'Team A' will now have 3 records

Team A2014-01-01 00:00:00.00010
Team A2014-01-02 00:00:00.00010
Team A2014-01-03 00:00:00.00010

'Team B' Has No records for '01/03/2014' so I need to insert values of '01/02/2014' StartDate for Team B for the missing date

So 'Team B' will now have 3 records

Team B2014-01-01 00:00:00.00030
Team B2014-01-02 00:00:00.00040
Team B2014-01-03 00:00:00.00040

As for 'Team C' we have values for all 3 dates, no inserts needed.

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Mar 23, 2014

I am working on a rewards program and I have a table whenever customer completes a trip, his total fare,business points earned for that particular trip and respective Promotional points gets inserted.

Now I have a scenario whenever customer business points accumulates to 10 then need to award 3 promotional points.

If Business Points=14 for a single trip then for the first 10 points respective Promo points will be awarded and the remaining 4 points should get carry forward for the next trip and this 4 points should get accumulated with the next trip Business Points and so on.

Basically need to check for every 10 Business points accumulated award some Promo points and carry forward remaining points.

Here is the sample table structure and data :

CREATE TABLE [dbo].[tblRedeems]
(
[Mobileno] [varchar](50) NOT NULL,
[TripNo] [int] NOT NULL,
[CustomerName] [varchar](50) NULL,
[TripEndTime] DATETIME NOT NULL,

[Code] .....

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Query Which Calculates A Field Value Based On Previous Row's Values

Jan 18, 2007

I need to write a t-sql query that will take the value of the previousrecord into consideration before calculating the current row's newcolumn value...Here's the situation...I have a query which return the following table structure...Full_Name Points----------------- ------------Name1 855Name2 805Name3 800Name4 775Name5 775Name6 741etc.... etc...I need to create a calculated column that tells me where the personranks in point position. The problem i run into is that in thesituation where two or more people have the same point value i need thecalculated rank column to display the same rank number (i.e. 4th orjust "4") I'm not sure how to to take into consideration the previousrow's point value to determine if it is the same as the current onebeing evaluated. If i new they were the same i could assign the samerank value (i.e. 4th or just "4").If any one has any insight that would be great.ThanksJeremy

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Feb 7, 2008

This code displays dates, File name, and File size for four seperate dates 11/20/2007 , 11/30/2007, 12/30/2007 and 01/31/2007 . I'm trying to show the percentage growth from date to date (ie 11/20/2007 -11/30/2007 percentage growth)

is there a way i can get the previous date file size for each entry, so i can have a variable for the calculation. Or i can get the calculate it within this code (ie database_size_mb / ((database_size_md ) where database_size_datetime -1) *100
or whatever the formula is for percentage growth.




Code Snippet
SELECT
Database_Size_Datetime,
Database_file_name,
Database_Size_Mb
FROM RC_STAT.dbo.Tbl_Database_Statistics AS Tbl_Database_Statistics_1
GROUP BY Database_Size_Datetime, Database_file_name, Database_Size_Mb

this is what it displays now:


2007-11-20 00:00:00.000 ACTReplication_Data 442.5000
2007-11-30 00:00:00.000 ACTReplication_Data 442.5000
2007-12-31 00:00:00.000 ACTReplication_Data 442.5000
2008-01-31 00:00:00.000 ACTReplication_Data 442.5000
2007-11-20 00:00:00.000 ACTReplication_Log 14.8125
2007-11-30 00:00:00.000 ACTReplication_Log 109.7500
2007-12-31 00:00:00.000 ACTReplication_Log 112.9375
2008-01-31 00:00:00.000 ACTReplication_Log 115.5625
2007-11-20 00:00:00.000 BAMArchive 0.6875
2007-11-30 00:00:00.000 BAMArchive 0.6875
2007-12-31 00:00:00.000 BAMArchive 0.6875
2008-01-31 00:00:00.000 BAMArchive 0.6875
2007-11-20 00:00:00.000 BAMArchive_log 0.4922
2007-11-30 00:00:00.000 BAMArchive_log 0.4922
2007-12-31 00:00:00.000 BAMArchive_log 0.4922
2008-01-31 00:00:00.000 BAMArchive_log 0.4922

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Nov 8, 2006

As the Microsoft Time Series algorithm implementation is based upon the Autoregressive Tree approach described in:

C. Meek, D. M. Chickering, D. Heckerman. Autoregressive Tree Models for Time-Series Analysis. In Proc. 2nd Intl. SIAM Conf. on Data Mining, 2002 (SDM-02). SIAM, pp. 229 €“ 244. http://www.siam.org/meetings/sdm02/proceedings/sdm02-14.pdf.

The model estimated is refererred to as an instance of "... autoregressive tree models of length p, denoted ART(p). An ART(p) model is an ART model in which each leaf node of the decision tree contains an AR(p) model, and the split variables for the decision tree are chosen from among the previous p variables in the time series..." (see the last paragraph of p. 2 of the paper).

What is the value of "p" used in the Microsoft Time Series implementation -- specifically, how many previous time series variables are used in estimating the model? It doesn't appear that this value can be specified in the algorithm parameters -- is that correct?

Thanks,

- Paul

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Apr 24, 2015

I am pulling down out of range values from a single table on one database to a different table on a different database on a different server (one i have full access to). Basically, it looks something like this:

id1 value1 prev_value1 value2 prev_value2 date prev_date
id2 value1 prev_value1 value2 prev_value2 date prev_date
id3 value1 prev_value1 value2 prev_value2 date prev_date

all the "prev"'s are null. I want to do one do one query that will get me the previous values and dates for each id from the original database. how to do this.

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Jul 7, 2015

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I want to generate months automatically after july 2013 till december 2013 in sql something like the below one:

Is there a way in sql to do this?

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Dec 12, 2013

I have my sql tables and query as shown below :

CREATE TABLE #ABC([Year] INT, [Month] INT, Stores INT);
CREATE TABLE #DEF([Year] INT, [Month] INT, SalesStores INT);
CREATE TABLE #GHI([Year] INT, [Month] INT, Products INT);
INSERT #ABC VALUES (2013,1,1);
INSERT #ABC VALUES (2013,1,2);

[code]....

I have @Year and @Month as parameters , both integers , example @Year = '2013' , @Month = '11'

SELECT T.[Year],
T.[Month]

-- select the sum for each year/month combination using a correlated subquery (each result from the main query causes another data retrieval operation to be run)
,
(SELECT SUM(Stores)
FROM #ABC
WHERE [Year] = T.[Year]
AND [Month] = T.[Month]) AS [Sum_Stores],
(SELECT SUM(SalesStores)

[code]....

What I want to do is to add more columns to the query which show the difference from the last month. as shown below. Example : The Diff beside the Sum_Stores shows the difference in the Sum_Stores from last month to this month.

Something like this :

+------+-------+------------+-----------------+-----|-----|---+-----------------
| Year | Month | Sum_Stores |Diff | Sum_SalesStores |Diff | Sum_Products |Diff|
+------+-------+------------+-----|------------+----|---- |----+--------------|
| 2013 | | | | | | | |
| 2013 | | | | | | | |
| 2013 | | | | | | | |
+------+-------+------------+-----|------------+--- |-----|----+---------| ----

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Aug 7, 2015

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1) Is there a way to identify what records were updated.
2) If the update done is not what the users wanted i need to undo and bring back the 400 records to their previous values.

I'm on sql server 2008.

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Sep 8, 2005

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look forward for your help
San

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Feb 4, 2007

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I could send everything to a loading table and then delete the duplicate records on that loading table and then copy the remaining records to my final destination, but I think that there should be a cleaner way.

John

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Sep 10, 2013

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Mar 31, 2014

I have 3 table

table_A
table_B
table_C

TABLE_A
SNO NAME ID
1 RAJU 070491
2 VAMSHI 089767
3 ARUNA 068908

TABLE_B

SNO NAME ID
2 RAJU 070491
4 JKLKJ 098766

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EX-

SNO NAME ID
1 RAJU 070491

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Dec 22, 2007

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search between 2 rows
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Code BlockSELECT empid, basedate, unit_date, shift, na
FROM dbo.empbase
WHERE (basedate = DATEADD(d, - 2, DATEADD(mm, DATEDIFF(m, 0, GETDATE()), 0))) AND (shift = 5)

AND

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TNX

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May 11, 2006

Hi,

I set up DB mirror between a primary (SQL1) and a mirror (SQL2); no witness. I have a problem when I issue command:


alter database DBmirrorTest
Set Partner = N'TCP://SQL2.mycom.com:5022';
go


The error message is:

The remote copy of database "DBmirrorTest" has not been rolled forward to a point in time that is encompassed in the local copy of the database log.

I have the steps below prior to the command. (Note that both servers' service accounts use the same domain account. The domain account I login to do db mirror setup is a member of the local admin group.)

1. backup database DBmirrorTest on SQL1

2. backup database log

3. copy db and log backup files to SQL2

4. restore db with norecovery

5. restore log with norecovery

6. create endpoints on both SQL1 and SQL2

CREATE ENDPOINT [Mirroring]

STATE=STARTED

AS TCP (LISTENER_PORT = 5022, LISTENER_IP = ALL)

FOR DATA_MIRRORING (ROLE = PARTNER)

7. enable mirror on mirror server SQL2

:connect SQL2

alter database DBmirrorTest

Set Partner = N'TCP://SQL1.mycom.com:5022';

go

8. Enable mirror on primary server SQL1

:connect SQL1

alter database DBmirrorTest

Set Partner = N'TCP://SQL2.mycom.com:5022';

go

This is where I got the error.

The remote copy of database "DBmirrorTest" has not been rolled forward to a point in time that is encompassed in the local copy



Thanks for any help,

KT

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