union vs union all mysql code example

Example 1: mysql union

SELECT supplier_id, supplier_name
FROM suppliers
WHERE supplier_id <= 500
UNION
SELECT company_id, company_name
FROM companies
WHERE company_name = 'Apple'
ORDER BY 2;

Example 2: sql server union all example

SELECT expression1, expression2, ... expression_n
FROM tables
[WHERE conditions]
UNION ALL
SELECT expression1, expression2, ... expression_n
FROM tables
[WHERE conditions];