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10.01.2008 at 02:57PM PDT, ID: 23779895
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9.9

Find Most Recent Related Record and then Update Field Based on Parent Record Field Value

Asked by dpmoney in MS SQL Server, SQL Server 2005, Data Manipulation

Tags:

Here's an abbreviated layout and the associated question.  We have 2 Tables:
ItemMaster
CostHistory

ItemMaster has 2 fields:
 - ItemID (PK)
 - VendorID

CostHistory has 4 fields
 - CostID (PK)
 - ItemID
 - VendorID
 - Price

Each record in the ItemMaster table can have multiple cost records associated with it.  They are linked by ItemID.  
Each cost record also houses a VendorID as the cost can be quoted from any of several hundred vendors.  
The challenge is we need to do the following:

Find the most recent cost entry for each ItemID where the VendorID is one of 3 types.  I've got that nailed (see below):

Select ItemID, Max(CostID) as MaxCostID
from CostHistory
Where VendorID in (92, 128, 267)
Group by ItemID

Then, for only the latest cost record associated with each item (as pulled from SQL above), set the VendorID equal to the VendorID from the linked record in the ItemMaster table.  Remember, they are linked by ItemID.
 
I just can't seem to get this additional layer of logic nailed and rolled into an update query.  
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[+][-]10.02.2008 at 12:23AM PDT, ID: 22621892

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About this solution

Zones: MS SQL Server, SQL Server 2005, Data Manipulation
Tags: T-SQL
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Solution Provided By: momi_sabag
Participating Experts: 1
Solution Grade: A
 
 
 
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