@Björn & Péter Török answers are apt for your first question.
For the second one, if it’s a large company then you can look for partnership program.
Oracle Partnership Network, there is a Program Qualification Criteria and fee to join.
See Join the Oracle PartnerNetwork Program and document Guide to Complete OPN Enrollment Application for more details. There are three levels Remarketer, Silver, Gold & Platinum
This will help companies to market their products and get more works.
Certified employees are one of the qualifications to be called as Oracle Certified Company or Partner.
Our company is Microsoft Certified Small Buisness Specialist and we are trying for Microsoft Certified Silver Partner, and I’m one of the people who have MS certification for this program.