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How to find duplicate records from sql server Table and Delete
How to find the duplicate record ?
Finding duplicate record from table using CTE.
WITH CTE
AS
(SELECT NAME,EMP_ID,ROW_NUMBER()
OVER(PARTITION BY NAME ORDER BY NAME)
AS NAMEDUP FROM EMPLOYEE)
SELECT * FROM CTE WHERE NAMEDUP > 1 ORDER BY NAME
Using Having Count
SELECT NAME,COUNT(NAME)FROM EMPLOYEE
GROUP BY NAME HAVING COUNT(*)>1
Using group by
SELECT NAME,COUNT(NAME) AS CNT
FROM EMPLOYEE
GROUP BY NAME
Deleting duplicate records from the table.
WITH CTE
AS
(SELECT NAME,EMP_ID,ROW_NUMBER()
OVER(PARTITION BY NAME ORDER BY NAME)
AS NAMEDUP FROM EMPLOYEE)
DELETE FROM CTE WHERE NAMEDUP > 1
Finding duplicate record from table using CTE.
WITH CTE
AS
(SELECT NAME,EMP_ID,ROW_NUMBER()
OVER(PARTITION BY NAME ORDER BY NAME)
AS NAMEDUP FROM EMPLOYEE)
SELECT * FROM CTE WHERE NAMEDUP > 1 ORDER BY NAME
Using Having Count
SELECT NAME,COUNT(NAME)FROM EMPLOYEE
GROUP BY NAME HAVING COUNT(*)>1
Using group by
SELECT NAME,COUNT(NAME) AS CNT
FROM EMPLOYEE
GROUP BY NAME
Deleting duplicate records from the table.
WITH CTE
AS
(SELECT NAME,EMP_ID,ROW_NUMBER()
OVER(PARTITION BY NAME ORDER BY NAME)
AS NAMEDUP FROM EMPLOYEE)
DELETE FROM CTE WHERE NAMEDUP > 1
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