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Message Posted: Thu, 18 Oct 2007 @ 10:14:01 GMT


     
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Subj:   Conditionally Converting a Many to One relationship
 
From:   McKie, Mathew

Hi,

I am new to Teradata but believe this is a general programming problem that isn't specific to Teradata but I need it to work in TD regardless.

I have my data in the following format:

     *ITEM_ID           ITEM_ATTRIBUTE*

     A                      1
     A                      2
     A                      3

     B                      1
     B                      1
     B                      1

     C                      3
     C                      2
     C                      3

In this problem item attributes 2 and 3 and qualitatively different from 1, and I want to create an item level table that considers all the item attributes for a given item_id and summarises appropriately.

The logical consideration is as follows:

If item_attribute in (2,3) *only*, then 4 else if item_attribute in (1) *only* then 5 else 6;

The target output table would look like:

     *ITEM_ID           ITEM_SUMMARY_FLAG*

     A                      6
     B                      5
     C                      4

Has anyone coded this kind of thing before? I tried coding this with nested IF and case statements but it doesn't seem to work. The only way I can get it to work is by creating multiple staging tables but I was hoping this could be programmed in a loop of some kind.

Any help would be greatly appreciated!


Thanks



     
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