what is union in sql

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Alicia
17 Mar 2018
1-- UNION: distinct values (slower)
2SELECT emp_name AS name from employees
3UNION       
4SELECT cust_name AS name from customers;
5
6-- UNION ALL: keeps duplicates (faster)
7SELECT emp_name AS name from employees
8UNION ALL      
9SELECT cust_name AS name from customers;
source
Giorgio
02 Feb 2020
1SELECT expression1, expression2, ... expression_n
2FROM tables
3[WHERE conditions]
4UNION ALL
5SELECT expression1, expression2, ... expression_n
6FROM tables
7[WHERE conditions];
Alex
19 Apr 2019
1Combines the results from 2 or more SELECT statements and returns only
2distinct values.
3Example: Returns the cities from the events and subscribers tables.
4SELECT city FROM events
5UNION
6SELECT city from subscribers;
Máximo
29 Jan 2018
1UNION:
2COMBINES THE RESULT OF 2 QUERY AND
3REMOVES DUPLICATE ROWS AND
4SORTS BY FIRST COLUMN
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