DWOperations
 usp_DimApplicationLoad_DupKeyCheck (Stored Procedure)
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Current Path:  DWOperations   Stored Procedures   usp_DimApplicationLoad_DupKeyCheck
  Properties
Property Value
Name usp_DimApplicationLoad_DupKeyCheck
Schema dbo
Is Encrypted False
Ansi Nulls Status True
Quoted Identifier Status True
Description
  Parameters
Name Data Type Direction Description
  Parent Dependencies (objects that usp_DimApplicationLoad_DupKeyCheck depends on)
Name Type
Table
  Child Dependencies (objects that depend on usp_DimApplicationLoad_DupKeyCheck)
Name Type
TABLE
  Extended Properties
Object Property Value
   Annotations
Object Property Value
  DDL
/****** Object: StoredProcedure [dbo].[usp_DimApplicationLoad_DupKeyCheck] Script Date: 03/09/2017 17:21:49 ******/
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
/*
Name:            usp_DimApplicationLoad_DupKeyCheck
Title:            Mark Duplicate Application Dimension
System/Project:    Admissions Dashboard - Application
Description:    This procedure will mark duplicate Application records and which one to select.
Revision History:
08/07/2014    Ian Peterson    Created.
*/
/* Primary Student Application Source SELECT Statement including Incremental Modifications*/
CREATE PROC [dbo].[usp_DimApplicationLoad_DupKeyCheck]
AS 
SET NOCOUNT ON
-- Create in-memory table for later use within this proc
CREATE TABLE #Application_Dup
    (
    [ApplicationAK] VARCHAR(23) NOT NULL
    )
-- populate table with duplicate ApplicationAK values
INSERT INTO #Application_Dup
    (
    [ApplicationAK]
    )
    select ApplicationAK
    from Verify_dbo_DimApplication
    group by ApplicationAK
    having COUNT(ApplicationAK) > 1
    
--Detect duplicate records and set flag
UPDATE Verify_dbo_DimApplication
SET RowIsDuplicate = 'Y'
FROM Verify_dbo_DimApplication
WHERE ApplicationAK 
IN
 (
 select ApplicationAK
 from #Application_Dup
 );
--Set RowIsSelected = N for duplicated records (detected above)
UPDATE RecordsToIgnore
SET RowIsSelected = 'N'
FROM dbo.Verify_dbo_DimApplication RecordsToIgnore
INNER JOIN
 (
 --Returns the first record for a set of duplicated Application
 --(as defined as minimum of surrogate key of temp table)
 SELECT ApplicationAK, MIN(VerifyApplicationSK) as Min_VerifyApplicationSK
 FROM Verify_dbo_DimApplication
 WHERE ApplicationAK in
  (
    select ApplicationAK
    from #Application_Dup
  ) 
 GROUP BY ApplicationAK 
 ) as Keeper
ON (
 Keeper.ApplicationAK = RecordsToIgnore.ApplicationAK
 AND
 Keeper.Min_VerifyApplicationSK <> RecordsToIgnore.VerifyApplicationSK
 )
WHERE RecordsToIgnore.RowIsDuplicate = 'Y';
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