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't
find 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) )
GO

The table has a foreign key to another table through the lead_seq
column:

CREATE TABLE Lead_Master (
lead_seq INT IDENTITY NOT NULL,
state CHAR(2) NOT NULL,
CONSTRAINT PK_Lead_Master PRIMARY KEY (lead_seq) )
GO

I need to write a query that will give me a sum of call_time broken
down 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 the
lead_seq for the previous row (based on lead_action_date) for the same
operator.

This is what I came up with:

SELECT LM.state, SUM(call_time)
FROM Lead_Action_History LAH
INNER JOIN Lead_Master LM ON (LM.lead_seq = LAH.lead_seq)
OR (LAH.lead_seq IS NULL
AND LM.lead_seq = (SELECT TOP 1
LAH2.lead_seq
FROM
Lead_Action_History LAH2
WHERE
LAH2.operator_id = LAH.operator_id
AND LAH2.lead_seq
IS NOT NULL
ORDER BY
LAH2.lead_action_date DESC))
GROUP BY LM.state


The problem is that Lead_Action_History has millions of records and
any solution that I've found involves one or more subqueries on it
which kills performance. I am going to look at using a covering index
with the solution above, but I thought that someone here might have
another 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 of
temporal data in a way that makes it easy to work with.

Thanks!
-Tom.

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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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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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I think I am asking this in the right place.

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How to Get previous record thru sql query
For the example
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Apr 16, 2014

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Bets way to show an example is with a jpeg image I have but having trouble inserting into this message...

SELECT a.[StartPrice]
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,a.[Colour]
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[Code] ...

Table

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[Code] ....

Want I'm trying to do select PriceCode PROMOTION and get previous price:

Get previous price
PROMOTION29-Nov-1301-Dec-13Wheel1BLACK31.2039.00

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I have one table :

file _target

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Like this ..

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2015-09-09 00:00:00.000   2015-09-16 00:00:00.000
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how to do this in SQL Server ??

using Cross Apply ?? Row_Number() ??

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-------------------
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Mar 16, 2008



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Nov 29, 2000

Data from as400 imports into SQL with blank fields which is the way as400 outputs records. How can you insert previous record of data null or blank field. ex:

ONETWO
a1
2
3
b1
2
3

Would want:

ONETWO
a1
a2
a3
b1
b2
b3

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Dec 10, 2007

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Group by DDay



Many thanks~~~~~
Fr New Learner

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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


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Jun 2, 2014

Having below data. SHCOMP (Customer ID), CBLNAM ( Customer name), SHDESC (service description), SHAMT (service charge), SHTYPE (F-> From T-> To)

CREATE TABLE #Temp(
[SHCOMP] [numeric](7, 0) NOT NULL,
[SHDESC] [char](35) NOT NULL,
[SHTYPE] [char](1) NOT NULL,
[SHAMT] [numeric](9, 2) NOT NULL,

[Code] ....

I need to remove records that have the same ID, Name, Description and Amount summary = 0, For example

SHCOMP CBLNAM SHDESC SHAMT SHTYPE

123 cust1 desc1 45 F remove
123 cust1 desc1 -45 T remove
123 cust1 desc1 45 F remove
123 cust1 desc1 -45 T remove
123 cust1 desc1 45 F

[Code] ....

Results

SHCOMP CBLNAM SHDESC SHAMT SHTYPE

123 cust1 desc1 45 F

123 cust1 desc1 -35 T

234 cust3 desc2 30 F

here is what I did but didn't work because sum is <> from 0 so is leaving all records

select SHCUST, SHDESC, ABS(SHAMT) SHAMT
into #t1
FROM #Temp
group by SHCUST, SHDESC, ABS(SHAMT)
having SUM(SHAMT)=0
order by SHCUST

delete S from #Temp S
join #t1 T on T.SHCUST = S.SHCUST and T.SHDESC = S.SHDESC

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Mar 15, 2006

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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.

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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:

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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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While trying to get to the correct previous record, I wrote the query below.

P.S. The attached .txt file includes a create and insert tbl_tmp sampling.

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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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CREATE TABLE #MyTable
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Count INT
)
INSERT INTO #MyTable (Teams,StartDate,Count)
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[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

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

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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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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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