what is the difference between union and union all
UNION ALL:
COMBINES THE RESULT OF 2 QUERY AND
DOESN'T REMOVE DUPLICATE ROWS
AND DOESN'T SORT BY FIRST COLUMN
UNION:
COMBINES THE RESULT OF 2 QUERY AND
REMOVES DUPLICATE ROWS AND
SORTS BY FIRST COLUMNsql union
-- UNION: distinct values (slower)
SELECT emp_name AS name from employees
UNION
SELECT cust_name AS name from customers;
-- UNION ALL: keeps duplicates (faster)
SELECT emp_name AS name from employees
UNION ALL
SELECT cust_name AS name from customers;Copyright © 2021 Codeinu
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