Remove Duplicates in SQL Without Using DISTINCT: 3 Powerful Methods
"In this video, we'll explore three different SQL techniques to remove duplicates from your data without using the DISTINCT keyword. We'll demonstrate using GROUP BY, UNION, and INTERSECT to achieve this. Whether you're prepping for an interview or just sharpening your SQL skills, this video will provide valuable insights. Watch till the end to understand the pros and cons of each method!"
--How can you remove duplicate records from a table without using the DISTINCT keyword?
Demonstrate three different SQL methods to achieve this.
drop table Without_Distinct
CREATE TABLE Without_Distinct (
id INT,
name VARCHAR(100)
);
INSERT INTO Without_Distinct (id, name) VALUES
(1, 'Alice'),
(2, 'Bob'),
(1, 'Alice'),
(3, 'Charlie'),
(2, 'Bob'),
(4, 'David');
--Method1: Group by
select *
from Without_Distinct
group by id,name
--Method2: UNION
select *
from Without_Distinct
UNION
select *
from Without_Distinct
----Method: Intersect
select *
from Without_Distinct
INTERSECT
select *
from Without_Distinct
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