sql-course/union.sql at main · Youtube-NikitaTymoshenko/sql-course · GitHub

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SELECT *
FROM salaries s;

-- union ---------------------------------------------

select
	'min_salary'		as parameter
	, MIN(salary_in_usd) 	as value
from salaries s

UNION

select
	'max_salary'			as parameter
	, MAX(salary_in_usd) 		as value
from salaries s
;

-----

select
	'min_salary'		as parameter
	, MIN(salary_in_usd) 	as value
from salaries s

union all

select
	'min_salary'		as parameter
	, MIN(salary_in_usd) 	as value
from salaries s;

-----

select
	'min_salary'		as parameter
	, MIN(salary_in_usd) 	as value
from salaries s

union

select
	'min_salary'		as parameter
	, MIN(salary_in_usd) 	as value
from salaries s;

-- Intersect ---------------------------------------------

SELECT email
FROM Customer

INTERSECT

SELECT Email
FROM Employee
;

-----

SELECT email
FROM Customer

EXCEPT

SELECT Email
FROM Employee
;