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SQL - Remove the duplicate rows from the table.

CREATE TABLE TBLTEST(ID INT,FIRSTNAME VARCHAR(20),LASTNAME VARCHAR(20))
INSERT INTO TBLTEST VALUES(1,'VANNI','RAJ')
INSERT INTO TBLTEST VALUES(1,'VANNI','RAJ')
INSERT INTO TBLTEST VALUES(2,'TEST','TEST')
;WITH CTE AS(
SELECT
 ID,FIRSTNAME,LASTNAME,
 ROW_NUMBER() OVER(ORDER BY FIRSTNAME,LASTNAME) ROW_NUM,
 RANK() OVER(ORDER BY FIRSTNAME,LASTNAME) RNK
FROM
 TBLTEST)
DELETE FROM CTE WHERE ROW_NUM <> RNK;
SELECT * fROM TBLTEST
DROP TABLE  TBLTEST
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