select multirecs from single recs without cursor

Question

select multirecs from single recs without cursor

shell_l_d

Ten Centuries

Points: 1387
More actions
September 10, 2010 at 2:44 am

#72060

Wondering if there's a way to do a select query without a cursor (although easy enough to do, curious if can be done without one) to do something like this... here's a small scale sample of what I'm trying to do with a select query...
Sample recs in PublicHols table:
26Jan2010,26Jan2010 -- = 1 day
25Apr2010,25Apr2010 -- = 1 day
25Dec2010,26Dec2010 -- = 2 days
Sample results expected:
26Jan2010,1
25Apr2010,1
25Dec2010,1
26Dec2010,1
Sample results at moment without cursor:
26Jan2010,1
25Apr2010,1
25Dec2010,2 -- want this split into 2 records instead
At moment I'm using this but it can return days > 1, so considering cursor to select them broken up into single records:
select
StartDate,
cast(EndDate-StartDate as integer)+1 as Days
from PublicHols
SQL Server 2000 (& 2005)

Viewing 8 posts - 1 through 7 (of 7 total)

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ChrisM@Work SSC Guru Points: 186127 More actions · Answer 1

This couldn't have come at a better time, Wayne & I had something similar this week. Can you post the ddl for the table, along with a few INSERTs to get some sample data into it?

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

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Understanding and using APPLY, (I) and (II) Paul White
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shell_l_d Ten Centuries Points: 1387 More actions · Answer 2

No problem thnx for the posting tip, good idea, I'll do that shortly...

however got this answer from another forum & it works perfectly. . 🙂

select dateadd(dd, n.number, h.StartDate)

from master..spt_values n

join PublicHols h on n.type = 'P'

and dateadd(dd,n.number,StartDate) between h.StartDate and h.EndDate

shell_l_d Ten Centuries Points: 1387 More actions · Answer 3

Here it is 🙂

--===== If test table exists, drop it

IF OBJECT_ID('TempDB..PublicHols','U') IS NOT NULL

DROP TABLE PublicHols

--===== Create test table

CREATE TABLE PublicHols

(

ID INT IDENTITY(1,1) PRIMARY KEY CLUSTERED,

Descr CHAR(64),

StartDate DATETIME,

EndDate DATETIME

)

--===== Special conditions

SET DATEFORMAT DMY

--===== Insert test data into test table

INSERT INTO PublicHols (Descr,StartDate,EndDate)

SELECT 'Fiestas Patrias','17/09/2007', '19/09/2007'

UNION ALL

SELECT 'Thanksgiving Break','22/11/2007', '23/11/2007'

UNION ALL

SELECT 'Australia Day','26/01/2010', '26/01/2010'

UNION ALL

SELECT 'Anzac Day','25/04/2010', '25/04/2010'

UNION ALL

SELECT 'Christmas Break','25/12/2010', '26/12/2010'

--==== Gather the data

select

h.ID,

h.Descr,

h.StartDate,

h.EndDate,

cast(h.EndDate-h.StartDate as integer)+1 as Days

from PublicHols h

--==== One solution to the problem (from another forum)

select

h.ID,

h.Descr,

dateadd(dd, n.number, h.StartDate) as HolDate,

1 as Days

from master..spt_values n

join PublicHols h on n.type = 'P'

and dateadd(dd,n.number,h.StartDate) between h.StartDate and h.EndDate

steve-893342 SSCarpal Tunnel Points: 4439 More actions · Answer 4

A variation using CROSS APPLY

;WITH cteTally (N) AS

(

SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0))

FROM master..syscolumns

)

SELECT P.ID, P.Descr, Z.HolDate, 1 AS Days

FROM PublicHols AS P

CROSS APPLY

(

SELECT DATEADD(DAY, N, StartDate) - 1

FROM cteTally

WHERE N < DATEDIFF(DAY, StartDate, EndDate) + 2

) AS Z (HolDate)

ORDER BY HolDate

WayneS SSC Guru Points: 95409 More actions · Answer 5

steve-893342 (9/11/2010)
A variation using CROSS APPLY

This is a SQL 7/2000 forum... the cross apply won't work unless posted in the wrong forum.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes

If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!

Links:
For better assistance in answering your questions
Performance Problems
Common date/time routines
Understanding and Using APPLY Part 1 & Part 2

steve-893342 SSCarpal Tunnel Points: 4439 More actions · Answer 6

WayneS (9/12/2010)
steve-893342 (9/11/2010)
A variation using CROSS APPLY
This is a SQL 7/2000 forum... the cross apply won't work unless posted in the wrong forum.

shell_l_d (9/10/2010)
Wondering if there's a way to do a select query without a cursor (although easy enough to do, curious if can be done without one) to do something like this... here's a small scale sample of what I'm trying to do with a select query...
SQL Server 2000 (& 2005)

Yeh, but it says &2005 in the original post, right?

WayneS SSC Guru Points: 95409 More actions · Answer 7

steve-893342 (9/12/2010)
WayneS (9/12/2010)
steve-893342 (9/11/2010)
A variation using CROSS APPLY
This is a SQL 7/2000 forum... the cross apply won't work unless posted in the wrong forum.
shell_l_d (9/10/2010)
Wondering if there's a way to do a select query without a cursor (although easy enough to do, curious if can be done without one) to do something like this... here's a small scale sample of what I'm trying to do with a select query...
SQL Server 2000 (& 2005)
Yeh, but it says &2005 in the original post, right?

I'll grant you that. My interpretation is that it would need to run on both versions.

Wayne
Microsoft Certified Master: SQL Server 2008
Author - SQL Server T-SQL Recipes

If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!

Links:
For better assistance in answering your questions
Performance Problems
Common date/time routines
Understanding and Using APPLY Part 1 & Part 2