Mastering SQL Set Operators: Union, Union All, Intersect, Minus
Unlock the Power of SQL Set Operators with this Comprehensive Tutorial!
In this video, we delve into the world of SQL set operators: Union, Union All, Intersect, and Minus. Whether you're a beginner or seasoned SQL developer, understanding these operators is essential for manipulating and combining data effectively.
We'll cover the fundamentals of each operator, explore real-world examples, and demonstrate their practical applications. By the end of this tutorial, you'll have a solid grasp of how to use these operators to query databases, extract meaningful insights, and streamline your data analysis workflow.
Don't miss out on this opportunity to elevate your SQL skills and take your database querying abilities to the next level. Watch now and become a master of SQL set operators
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-- Create employees table
CREATE OR REPLACE TABLE employees (
id INT,
name VARCHAR(50),
department VARCHAR(50)
);
-- Insert some sample data into employees table
INSERT INTO employees (id, name, department) VALUES
(1, 'John', 'HR'),
(2, 'Jane', 'Engineering'),
(3, 'Alice', 'Marketing'),
(4, 'Bob', 'Finance');
SELECT * FROM employees;
-- Create new_hires table
CREATE OR REPLACE TABLE new_hires (
id INT,
name VARCHAR(50),
department VARCHAR(50)
);
-- Insert some sample data into new_hires table
INSERT INTO new_hires (id, name, department) VALUES
(3, 'Alice', 'Marketing'),
(4, 'Bob', 'Finance'),
(5, 'Eva', 'Engineering'),
(6, 'Michael', 'Finance');
SELECT * FROM new_hires;
--UNION
SELECT id, name, department FROM employees
UNION
SELECT id, name, department FROM new_hires;
--UNION ALL
SELECT id, name, department FROM employees
UNION ALL
SELECT id, name, department FROM new_hires;
SELECT id emp_id, name, department FROM employees
UNION ALL
SELECT id emp_id1, name, department FROM new_hires
ORDER BY emp_id;
--ORDER BY cluae appear only once at the end of the compound query
--Component queries cannot have individul order by clauses
--The order by clause recognizes only the columns of the first select query
--INTERSECT
SELECT id, name, department FROM employees
INTERSECT
SELECT id, name, department FROM new_hires;
--MINUS
SELECT id, name, department FROM employees
MINUS
SELECT id, name, department FROM new_hires;
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