Installing Oracle XE is easy and using SQL on Oracle is no more difficult than using SQL on most other platforms. The more difficult parts of Oracle come with larger systems that need administration. The things that make being a database administrator hard mostly do not apply to people in your situation.
The act of binding oneself by a social, legal, or moral tie to someone. obligation(Noun) A social, legal, or moral requirement, duty, contract, or promise that compels someone to follow or avoid a particular course of action. obligation(Noun) A course of action imposed by society, law, or conscience by which someone is bound or restricted.
General: Bond of moral duty (whether of necessity or of one's own choosing) that ties two or more parties together. 2. Accounting: Duty to make future payment that is incurred as soon as a purchase order is placed, encumbers a certain sum of money, and is called obligation incurred.