Identify Duplicate Records according to Multiple Criteria

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Identify Duplicate Records according to Multiple Criteria

Sy-1148362

Right there with Babe

Points: 759
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November 30, 2013 at 2:32 am

#395918

Hi There!
I have an Employee table with Columns:
EmpID | FirstName | MiddleName | LastName | SSN | BirthDate | HireDate | City | Zip
Requirement: I have to identify the duplicate records based on below criteria:
Criteria1: SSN
Criteria2: FirstName, LastName, BirthDate
Criteria2: FirstName, LastName, City, Zip
Please tell how to accomplish this task........Thanks in Advance

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PravB4u Default port Points: 1401 More actions · Answer 1

Hi,

do you want to accomplish all three conditions in single query or you need three different queries.

Praveen D'sa
MCITP - Database Administrator 2008
http://sqlerrors.wordpress.com

Jeff Moden SSC Guru Points: 1004414 More actions · Answer 2

Sy-1148362 (11/30/2013)
Hi There!
I have an Employee table with Columns:
EmpID | FirstName | MiddleName | LastName | SSN | BirthDate | HireDate | City | Zip
Requirement: I have to identify the duplicate records based on below criteria:
Criteria1: SSN
Criteria2: FirstName, LastName, BirthDate
Criteria2: FirstName, LastName, City, Zip
Please tell how to accomplish this task........Thanks in Advance

You'll get much more help if you show what you've tried.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

CKX SSCrazy Points: 2519 More actions · Answer 3

Sy-1148362 (11/30/2013)
Hi There!
I have an Employee table with Columns:
EmpID | FirstName | MiddleName | LastName | SSN | BirthDate | HireDate | City | Zip
Requirement: I have to identify the duplicate records based on below criteria:
Criteria1: SSN
Criteria2: FirstName, LastName, BirthDate
Criteria2: FirstName, LastName, City, Zip
Please tell how to accomplish this task........Thanks in Advance

A search on this site would show you quite a few ways to identify duplicates.

The use of ROW_NUMBER or GROUP BY being a couple that come to mind.

With your criteria specified multiple times though you're not quite clear on how you would like to handle this.

Maybe posting what you've tried as has been suggested would give an idea of what you are actually trying to do.

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 4

Here's the simplest way. Without further information it's unlikely to be the best.

-- I have an Employee table with Columns:

DROP TABLE #Employee

CREATE TABLE #Employee (EmpID INT IDENTITY(1,1), FirstName VARCHAR(100), MiddleName VARCHAR(100), LastName VARCHAR(100),

SSN VARCHAR(25), BirthDate DATE, HireDate DATE, City VARCHAR(100), Zip VARCHAR(10))

INSERT INTO #Employee (FirstName, MiddleName, LastName, SSN, BirthDate, HireDate, City, Zip)

SELECT 'John', NULL, 'Smith', 'Smooth bitter', GETDATE(), GETDATE(), 'London', 'W1' UNION ALL

SELECT 'Timothy', NULL, 'Taylor', 'Landlord', GETDATE(), GETDATE(), 'London', 'W1' UNION ALL

SELECT 'Timothy', NULL, 'Taylor', 'Y', GETDATE()+1, GETDATE()+1, 'London', 'W1' UNION ALL

SELECT 'Timothy', NULL, 'Taylor', 'X', GETDATE(), GETDATE(), 'P', 'Q' UNION ALL

SELECT 'X', NULL, 'Y', 'Landlord', GETDATE(), GETDATE(), 'Z', 'A'

-- Requirement: I have to identify the duplicate records based on below criteria:

SELECT

EmpID, FirstName, MiddleName, LastName, SSN, BirthDate, HireDate, City, Zip,

Criteria1, Criteria2, Criteria3

FROM (

SELECT

EmpID, FirstName, MiddleName, LastName, SSN, BirthDate, HireDate, City, Zip,

Criteria1 = COUNT(*) OVER(PARTITION BY SSN),

Criteria2 = COUNT(*) OVER(PARTITION BY FirstName, LastName, BirthDate),

Criteria3 = COUNT(*) OVER(PARTITION BY FirstName, LastName, City, Zip)

FROM #Employee

) d

WHERE Criteria1+Criteria2+Criteria3 > 3

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

Jeff Moden SSC Guru Points: 1004414 More actions · Answer 5

ChrisM@Work (12/2/2013)
Here's the simplest way. Without further information it's unlikely to be the best.
-- I have an Employee table with Columns:
DROP TABLE #Employee
CREATE TABLE #Employee (EmpID INT IDENTITY(1,1), FirstName VARCHAR(100), MiddleName VARCHAR(100), LastName VARCHAR(100),
SSN VARCHAR(25), BirthDate DATE, HireDate DATE, City VARCHAR(100), Zip VARCHAR(10))
INSERT INTO #Employee (FirstName, MiddleName, LastName, SSN, BirthDate, HireDate, City, Zip)
SELECT 'John', NULL, 'Smith', 'Smooth bitter', GETDATE(), GETDATE(), 'London', 'W1' UNION ALL
SELECT 'Timothy', NULL, 'Taylor', 'Landlord', GETDATE(), GETDATE(), 'London', 'W1' UNION ALL
SELECT 'Timothy', NULL, 'Taylor', 'Y', GETDATE()+1, GETDATE()+1, 'London', 'W1' UNION ALL
SELECT 'Timothy', NULL, 'Taylor', 'X', GETDATE(), GETDATE(), 'P', 'Q' UNION ALL
SELECT 'X', NULL, 'Y', 'Landlord', GETDATE(), GETDATE(), 'Z', 'A'
-- Requirement: I have to identify the duplicate records based on below criteria:
SELECT
EmpID, FirstName, MiddleName, LastName, SSN, BirthDate, HireDate, City, Zip,
Criteria1, Criteria2, Criteria3
FROM (
SELECT
EmpID, FirstName, MiddleName, LastName, SSN, BirthDate, HireDate, City, Zip,
Criteria1 = COUNT(*) OVER(PARTITION BY SSN),
Criteria2 = COUNT(*) OVER(PARTITION BY FirstName, LastName, BirthDate),
Criteria3 = COUNT(*) OVER(PARTITION BY FirstName, LastName, City, Zip)
FROM #Employee
) d
WHERE Criteria1+Criteria2+Criteria3 > 3

I could certainly be wrong but this seemed to be a school assignment which is why I wanted the OP to show what has been tried. 😉

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)