Hello everyone,
I need to remove duplicate rows from the table and for that I made one query with CTE which will remove all duplicate rows from the table.
Here I put an example. So you can get better idea of it.
DROP TABLE DuplicateRcordTable
CREATE TABLE DuplicateRcordTable (Col1 INT, Col2 INT)
INSERT INTO DuplicateRcordTable
SELECT 1, 1
UNION ALL
SELECT 1, 1 --duplicate
UNION ALL
SELECT 1, 1 --duplicate
UNION ALL
SELECT 1, 2
UNION ALL
SELECT 1, 2 --duplicate
UNION ALL
SELECT 1, 3
UNION ALL
SELECT 1, 4
SELECT * FROM DuplicateRcordTable
;with DuplicateRows
AS
(
SELECT *,ROW_NUMBER() over(partition by Col1,Col2 order by Col1) DuplicateRow FROM DuplicateRcordTable
)
DELETE FROM DuplicateRows where DuplicateRow>1
SELECT * FROM DuplicateRcordTable
RESULT:-
Before deleted duplicate records:-
After deleted duplicate records
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5 years ago
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