Denormalizing Via SELECT

Apr 19, 2007

I have two tables related many-to-many so there's an intersection table in the middle. The first table is dbo.Event. It has a list of gigs (events) my company has booked to provide services for. The second table is dbo.Employee which has a list of employees. The intersection table dbo.EventEmployee contains which employee(s) have been scheduled to work. The intersection table has some status information whether the employee asked to work, is scheduled to work, etc. The data type is TINYINT

Here's what I want to do. Create a SELECT statement that basically denormalizes these three tables so the recordset looks like this:



Event.Name, Event.StartDate, Event.Location, Ed, Mary, Tom, Steve, Sally



The idea is to get the list of employees to become columns in the result set. If an employee is scheduled for the event there is a non-null value (Status), if an employee isn't scheduled there is a NULL in their column. For example:



CDC, 2/12/07, Chicago, NULL, 0, 0, NULL, NULL

NYC, 11/04/07, New York, 0, 0, 0, 0, NULL



The first record Mary & Tom are scheduled to work the CDC. The second row everyone except Sally is scheduled to work.



I've thought of cursor based solutions but performance will be rather poor. There are multiple places I want to use this type of solution so I'm hoping there's a more elegant way to accomplish this. SQL 2000 with latest SP. Help. This is beyond my SQL abilities.



harrier

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Need Help With Denormalizing Query

Jul 10, 2006

Hello,I am currently working with a data mart. The business wants a view ofthe data that shows columns from the main table along with up to 6codes from a related table (not related by the full PK of the maintable though). They don't care about the order of the codes or how theyare assigned to their columns. Here is an example, which will hopefullymake this clearer:CREATE TABLE dbo.Main_Table (my_id INT NOT NULL,line_number SMALLINT NOT NULL,some_other_columns VARCHAR(20) NULL )GOALTER TABLE dbo.Main_TableADD CONSTRAINT PK_Main_Table PRIMARY KEY CLUSTERED (my_id, line_number)GOCREATE TABLE dbo.Related_Table (my_id INT NOT NULL,my_code CHAR(6) NOT NULL )GOALTER TABLE dbo.Related_TableADD CONSTRAINT PK_Related_Table PRIMARY KEY CLUSTERED (my_id, my_code)GO-- The two tables above are related by my_idINSERT INTO dbo.Main_Table (my_id, line_number) VALUES (1, 1)INSERT INTO dbo.Main_Table (my_id, line_number) VALUES (1, 2)INSERT INTO dbo.Main_Table (my_id, line_number) VALUES (1, 3)INSERT INTO dbo.Main_Table (my_id, line_number) VALUES (2, 1)INSERT INTO dbo.Main_Table (my_id, line_number) VALUES (2, 2)INSERT INTO dbo.Related_Table (my_id, my_code) VALUES (1, '22.63')INSERT INTO dbo.Related_Table (my_id, my_code) VALUES (1, '73.09')INSERT INTO dbo.Related_Table (my_id, my_code) VALUES (1, '51.23')INSERT INTO dbo.Related_Table (my_id, my_code) VALUES (2, '26.42')GOThe results that they would want to see are:my_id line_number my_code_1 my_code_2 my_code_3 my_code_41 1 22.63 73.09 51.23 NULL1 2 22.63 73.09 51.23 NULL1 3 22.63 73.09 51.23 NULL2 1 26.42 NULL NULL NULL2 2 26.42 NULL NULL NULLI'm pretty sure that I will need to load a table with the data in thisformat (or something similar) since generating this output on the flyfor the users will not work performance-wise (the main table is apartitioned table with 6 partitions, each containting 35M+ rows, whilethe related table is a single table that contains about 2M rows. Thereis additional logic that has to be done with a similar table of 90Mrows. So, I will try to load a table with this denormalized view of theworld. I could probably add some sort of sequence number toRelated_Table if you think that might help (then it just becomes asimple series of left outer joins).Any thoughts?Thanks!-Tom.

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InsuranceSegments Table (PK = all columns combined)
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The catch:
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In my pseodo thinking
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J

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Please help, I've used all of my capacities...



I need to denormalize some data...
I'll give an example.



Source table: (bold €“ PK)

ID_Company Data (yyyy-mm-dd) Type Quantity

FORD 2000-01-01 A 100

FORD 2000-06-01 A 200

FORD 2000-07-01 B 150

FORD 2002-01-01 A 400

FIAT 1999-01-01 A 300

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FORD 2002 400 150 0

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FIAT 2001 300 750 0

FIAT 2002 300 750 250



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