Compare the total number of orders between customer "Apollo Ltd" and "Pacific Ltd".
"Apollo Ltd" and "Pacific Ltd" are both Customer Names; total number of orders refers to COUNT(OrderNumber)
SELECT SUM(CASE WHEN T2.`Customer Names` = 'Apollo Ltd' THEN 1 ELSE 0 END), SUM(CASE WHEN T2.`Customer Names` = 'Pacific Ltd' THEN 1 ELSE 0 END) FROM `Sales Orders` AS T1 INNER JOIN Customers AS T2 ON T2.CustomerID = T1._CustomerID