DWOperations
 usp_DimStudentSuccessCohortLoad_DupKeyCheck (Stored Procedure)
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Current Path:  DWOperations   Stored Procedures   usp_DimStudentSuccessCohortLoad_DupKeyCheck
  Properties
Property Value
Name usp_DimStudentSuccessCohortLoad_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_DimStudentSuccessCohortLoad_DupKeyCheck depends on)
Name Type
Table
  Child Dependencies (objects that depend on usp_DimStudentSuccessCohortLoad_DupKeyCheck)
Name Type
TABLE
  Extended Properties
Object Property Value
   Annotations
Object Property Value
  DDL
/****** Object: StoredProcedure [dbo].[usp_DimStudentSuccessCohortLoad_DupKeyCheck] Script Date: 03/09/2017 17:21:49 ******/
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
/* Primary Student Term Source SELECT Statement including Incremental Modifications*/
CREATE PROC [dbo].[usp_DimStudentSuccessCohortLoad_DupKeyCheck]
AS 
SET NOCOUNT ON
-- Create in-memory table for later use within this proc
CREATE TABLE #Stdnt_Cohort_Dup
    (
    [StudentSuccessCohortAK] VARCHAR(15) NOT NULL
    )
-- populate table with duplicate StudentSuccessCohortAK values
INSERT INTO #Stdnt_Cohort_Dup
    (
    [StudentSuccessCohortAK]
    )
    select StudentSuccessCohortAK
    from Verify_dbo_DimStudentSuccessCohort
    group by StudentSuccessCohortAK
    having COUNT(StudentSuccessCohortAK) > 1
    
--Detect duplicate records and set flag
UPDATE Verify_dbo_DimStudentSuccessCohort
SET RowIsDuplicate = 'Y'
FROM Verify_dbo_DimStudentSuccessCohort
WHERE StudentSuccessCohortAK 
IN
 (
 select StudentSuccessCohortAK
 from #Stdnt_Cohort_Dup
 );
--Set RowIsSelected = N for duplicated records (detected above)
UPDATE RecordsToIgnore
SET RowIsSelected = 'N'
FROM dbo.Verify_dbo_DimStudentSuccessCohort RecordsToIgnore
INNER JOIN
 (
 --Returns the first record for a set of duplicated StudentTerms
 --(as defined as minimum of surrogate key of temp table)
 SELECT StudentSuccessCohortAK, MIN(VerifyStudentSuccessCohortSK) as Min_VerifyStudentSuccessCohortSK
 FROM Verify_dbo_DimStudentSuccessCohort
 WHERE StudentSuccessCohortAK in
  (
    select StudentSuccessCohortAK
    from #Stdnt_Cohort_Dup
  ) 
 GROUP BY StudentSuccessCohortAK 
 ) as Keeper
ON (
 Keeper.StudentSuccessCohortAK = RecordsToIgnore.StudentSuccessCohortAK
 AND
 Keeper.Min_VerifyStudentSuccessCohortSK <> RecordsToIgnore.VerifyStudentSuccessCohortSK
 )
WHERE RecordsToIgnore.RowIsDuplicate = 'Y';
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