“Delete Duplicates using Subquery in SQL”
In this video, I’ll show you exactly how to delete duplicate records using a subquery, while preserving one unique instance of each record. Perfect for cleaning up your tables, improving performance, and maintaining data integrity.
-- -- -- -- -- Hands-on practice: use the following data -- -- -- -- --
-- Delete Duplicate Rows Using Subquery in SQL
CREATE TABLE Employees (
EmpID INT PRIMARY KEY,
EmpName VARCHAR(50),
Department VARCHAR(50)
);
INSERT INTO Employees (EmpID, EmpName, Department) VALUES
(1, 'Alice', 'HR'),
(2, 'Bob', 'IT'),
(3, 'Alice', 'HR'), -- duplicate of EmpID=1
(4, 'Charlie', 'Finance'),
(5, 'Bob', 'IT'), -- duplicate of EmpID=2
(6, 'David', 'HR'),
(7, 'Eve', 'Finance'),
(8, 'Eve', 'Finance'), -- duplicate of EmpID=7
(9, 'Eve', 'Finance'); -- duplicate of EmpID=7
SELECT * FROM Employees;
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