Stored Procedure - usp_DimStudent

Property	Value
Name	usp_DimStudent_DupKeyCheck
Schema	dbo
Is Encrypted	False
Ansi Nulls Status	True
Quoted Identifier Status	True
Description

Name

Data Type

Direction

Description

Name	Type
Verify_dbo_DimStudent	Table

Name	Type
Verify_dbo_DimStudent	TABLE

Object

Property

Value

Object

Property

Value

/****** Object: StoredProcedure [dbo].[usp_DimStudent_DupKeyCheck] Script Date: 03/09/2017 17:21:49 ******/
SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
/* Select and flag duplicates */
CREATE PROC [dbo].[usp_DimStudent_DupKeyCheck]
AS
SET NOCOUNT ON
-- Create in-memory table for later use within this proc
CREATE TABLE #Stdnt_Dup
    (
    [StudentIdAK] VARCHAR(9) NOT NULL
    )
-- Populate table with duplicate StudentIdAK values
INSERT INTO #Stdnt_Dup
    (
    [StudentIDAK]
    )
    SELECT StudentIdAK
    FROM Verify_dbo_DimStudent
    GROUP BY StudentIdAK
    HAVING COUNT(StudentIdAK) > 1

--Detect duplicate records and set flag
UPDATE Verify_dbo_DimStudent
SET RowIsDuplicate = 'Y'
FROM Verify_dbo_DimStudent
WHERE StudentIdAK
IN
(
SELECT StudentIdAK
FROM #Stdnt_Dup
);
--Set RowIsSelected = N for duplicated records (detected above)
UPDATE RecordsToIgnore
SET RowIsSelected = 'N'
FROM dbo.Verify_dbo_DimStudent RecordsToIgnore
INNER JOIN
(
--Returns the first record for a set of duplicated Students
--(as defined as minimum of surrogate key of temp table)
SELECT StudentIdAK, MIN(VerifyStudentIdSK) as Min_VerifyStudentIdSK
FROM Verify_dbo_DimStudent
WHERE StudentIdAK in
  (
    SELECT StudentIdAK
    FROM #Stdnt_Dup
  )
GROUP BY StudentIdAK
) AS Keeper
ON (
Keeper.StudentIdAK = RecordsToIgnore.StudentIdAK
AND
Keeper.Min_VerifyStudentIdSK <> RecordsToIgnore.VerifyStudentIdSK
)
WHERE RecordsToIgnore.RowIsDuplicate = 'Y';