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Home » SQL Server 2008 » T-SQL (SS2K8) » Grouping records by time interval
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geert.de.vylder
Posted Wednesday, March 06, 2013 8:47 AM
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ChrisM@Work (3/6/2013)

I meant in terms of potentially reducing the rowcount.
Let's call a set from this table containing the same day, all of the intervals, and the same Event_Channel, a frame. One frame contains 96 rows, one row per interval. There are 9 event channels so there are 864 rows per date. Multiply 864 by the number of dates in the tickets table - 1366 - to yield the number of rows in the matrix table.
One possibility is to remove frames which don't have any corresponding rows in the tickets table.


Sorry,

I misunderstood you.
Then the best would be to work with a variable of the datetime type and set this variable to a fix date (for example 2013-03-01 YYYY-MM-DD format) or to set it to yesterdays date. And then retreive the frame for all 9 event channels.

Would that be better?

Greetz,

Geert
Post #1427464
ChrisM@Work
Posted Wednesday, March 06, 2013 8:54 AM


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geert.de.vylder (3/6/2013)
ChrisM@Work (3/6/2013)

I meant in terms of potentially reducing the rowcount.
Let's call a set from this table containing the same day, all of the intervals, and the same Event_Channel, a frame. One frame contains 96 rows, one row per interval. There are 9 event channels so there are 864 rows per date. Multiply 864 by the number of dates in the tickets table - 1366 - to yield the number of rows in the matrix table.
One possibility is to remove frames which don't have any corresponding rows in the tickets table.


Sorry,

I misunderstood you.
Then the best would be to work with a variable of the datetime type and set this variable to a fix date (for example 2013-03-01 YYYY-MM-DD format) or to set it to yesterdays date. And then retreive the frame for all 9 event channels.

Would that be better?

Greetz,

Geert


I've no idea, Geert. Folks here on SSC will help you with coding decisions; this is more of a business decision. A date filter seems sensible to me but is it appropriate for the consumers of the data? How many days' worth of data are other folks expecting to see?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Post #1427471
geert.de.vylder
Posted Wednesday, March 06, 2013 9:06 AM
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ChrisM@Work (3/6/2013)


I've no idea, Geert. Folks here on SSC will help you with coding decisions; this is more of a business decision. A date filter seems sensible to me but is it appropriate for the consumers of the data? How many days' worth of data are other folks expecting to see?


We would like to see a month worth of data. Let's say February.
Post #1427477
ChrisM@Work
Posted Wednesday, March 06, 2013 9:12 AM


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geert.de.vylder (3/6/2013)
ChrisM@Work (3/6/2013)


I've no idea, Geert. Folks here on SSC will help you with coding decisions; this is more of a business decision. A date filter seems sensible to me but is it appropriate for the consumers of the data? How many days' worth of data are other folks expecting to see?


We would like to see a month worth of data. Let's say February.


How about "all data for last month - which as of today will be February"?

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Post #1427482
ChrisM@Work
Posted Wednesday, March 06, 2013 9:32 AM


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geert.de.vylder (3/6/2013)
ChrisM@Work (3/6/2013)


I've no idea, Geert. Folks here on SSC will help you with coding decisions; this is more of a business decision. A date filter seems sensible to me but is it appropriate for the consumers of the data? How many days' worth of data are other folks expecting to see?


We would like to see a month worth of data. Let's say February.


There's no data in the table for February 

-- last month:
SELECT 
	MonthStart = DATEADD(month,DATEDIFF(month,0,getdate())-1,0), -- 1st Feb
	MonthEnd = DATEADD(month,DATEDIFF(month,0,getdate()),0) -- 1st Mar 
	
-- month before last:
SELECT 
	MonthStart = DATEADD(month,DATEDIFF(month,0,getdate())-2,0), -- 1st Jan
	MonthEnd = DATEADD(month,DATEDIFF(month,0,getdate())-1,0) -- 1st Feb 

-- Usage:
SELECT *
FROM Tussen_Tickets
WHERE Ticket_Closed_DateTime >= DATEADD(month,DATEDIFF(month,0,getdate())-1,0) -- greater than or equal to 
	AND Ticket_Closed_DateTime < DATEADD(month,DATEDIFF(month,0,getdate()),0) -- LESS THAN

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Post #1427495
geert.de.vylder
Posted Thursday, March 07, 2013 2:06 AM
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ChrisM@Work (3/6/2013)


There's no data in the table for February 

-- last month:
SELECT 
	MonthStart = DATEADD(month,DATEDIFF(month,0,getdate())-1,0), -- 1st Feb
	MonthEnd = DATEADD(month,DATEDIFF(month,0,getdate()),0) -- 1st Mar 
	
-- month before last:
SELECT 
	MonthStart = DATEADD(month,DATEDIFF(month,0,getdate())-2,0), -- 1st Jan
	MonthEnd = DATEADD(month,DATEDIFF(month,0,getdate())-1,0) -- 1st Feb 

-- Usage:
SELECT *
FROM Tussen_Tickets
WHERE Ticket_Closed_DateTime >= DATEADD(month,DATEDIFF(month,0,getdate())-1,0) -- greater than or equal to 
	AND Ticket_Closed_DateTime < DATEADD(month,DATEDIFF(month,0,getdate()),0) -- LESS THAN



I do get 160 rows for february from the Tusen_Tickets table. But this is the Original not aggregated table Tussen_Tickets.
I'm getting desperate now, because I dont get any result from the last query with the 2 temp tables.
Post #1427839
ChrisM@Work
Posted Thursday, March 07, 2013 2:46 AM


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SELECT MAX(Ticket_Closed_DateTime)
FROM Tussen_Tickets

-- returns '2013-01-17 10:22:00.000'

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Post #1427856
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