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Home » Data Warehousing » Integration Services » SSIS datediff and dateadd
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var05
Posted Monday, December 03, 2012 7:48 AM
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Hi All,


I wanted to find the starting of the week and poulate it as an additional column. Im trying to use dervived column in SSIS

SQL Equivalent is:

SELECT DATEADD(WK, DATEDIFF(WK,0,'11/01/2012'), 0)

2012-10-29 00:00:00.000 - Fine

Im not able to use the same sql statement in SSIS dervived col. I tried using the below expression:

DATEADD("WK",DATEDIFF("WK",(DT_DBDATE)0,'11/01/2012'),(DT_DBDATE)0).... --- But this returns diff results

03/11/2012 00:00:00. ---It returns the subsequent saturday and not the staring day of the week i.e Monday. Any help on this?

Thanks!
Post #1391955
Ray M
Posted Monday, December 03, 2012 8:55 AM
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SELECT CAST(0 AS DATETIME)

Resolves to
1900-01-01 00:00:00.000


(DT_DBDATE)0

Resolves to
1899-12-30


There's your two days difference
Post #1392009
var05
Posted Monday, December 03, 2012 9:09 AM
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Thanks for your reply..

I tired using all the datetime expressions related to date with the below exprseeion in dervived column

DATEADD("WK",DATEDIFF("WK",0,date),0)- but the same query gives correct answers in sql , but shows error in SSIS dervived expressions.


I get results this way :-

Date Available in db Result Expected Result
01/11/2012 01:28 03/11/2012 00:00 29/10/2012 00:00
04/11/2012 19:12 10/11/2012 00:00 03/11/2012 00:00
06/11/2012 09:34 10/11/2012 00:00 03/11/2012 00:00
12/11/2012 10:59 17/11/2012 00:00 10/11/2012 00:00


How to achieve the expected results using dervived column in SSIS- every date available in DB, should show the starting day - Monday of that particular week.

Thanks!

Expected result-(29/10,03/11,10/11 are the starting of the week-Monday)
Post #1392017
Lynn Pettis
Posted Monday, December 03, 2012 9:33 AM


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var05 (12/3/2012)
Hi All,


I wanted to find the starting of the week and poulate it as an additional column. Im trying to use dervived column in SSIS

SQL Equivalent is:

SELECT DATEADD(WK, DATEDIFF(WK,0,'11/01/2012'), 0)

2012-10-29 00:00:00.000 - Fine

Im not able to use the same sql statement in SSIS dervived col. I tried using the below expression:

DATEADD("WK",DATEDIFF("WK",(DT_DBDATE)0,'11/01/2012'),(DT_DBDATE)0).... --- But this returns diff results

03/11/2012 00:00:00. ---It returns the subsequent saturday and not the staring day of the week i.e Monday. Any help on this?

Thanks!


Change this:

DATEADD("WK",DATEDIFF("WK",(DT_DBDATE)0,'11/01/2012'),(DT_DBDATE)0)....

To this:

DATEADD("WK",DATEDIFF("WK",(DT_DBDATE)"1900-01-01",'11/01/2012'),(DT_DBDATE)"1900-01-01")....

Let us know if this works.


Lynn Pettis

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Post #1392027
Lynn Pettis
Posted Monday, December 03, 2012 9:10 PM


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As Ray indicated earlier, (DT_DBDATE)0 evaluates to 1899-12-30. This would be equivalent to using -2 inplace of 0 in the T-SQL calls as shown here:


/*
Date Available in db    Result              Expected Result
01/11/2012 01:28        03/11/2012 00:00    29/10/2012 00:00
04/11/2012 19:12        10/11/2012 00:00    03/11/2012 00:00
06/11/2012 09:34        10/11/2012 00:00    03/11/2012 00:00
12/11/2012 10:59        17/11/2012 00:00    10/11/2012 00:00
*/
WITH TestData AS (
SELECT
    cast(TestDate as datetime) TestDate
FROM
    (VALUES ('20121101 01:28'),('20121104 19:12'),('20121106 09:34'),('20121112 10:59'))dt(TestDate)
)
select
    TestDate,
    dateadd(wk,datediff(wk,0,TestDate),0),
    dateadd(wk,datediff(wk,-2,TestDate),-2)
from
    TestData;


Lynn Pettis

For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here or when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here and here
Managing Transaction Logs

SQL Musings from the Desert Fountain Valley SQL (My Mirror Blog)
Post #1392239
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