unionn in sql code example
Example 1: sql 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;
Example 2: union in sql
UNION:
COMBINES THE RESULT OF 2 QUERY AND
REMOVES DUPLICATE ROWS AND
SORTS BY FIRST COLUMN