How and where can I earn extra money as a pl/sql developer?

Question

Oracle

How and where can I earn extra money as a pl/sql developer? Well, or participate in any projects in your free time.
On odesk and upwork, something is not enough for oracle ....

Answer 1

Oracle has money to buy only from large companies that do not need freelancers. So in this area everything is difficult with part-time work.
In order, for example, to optimize other people's requests, you need to know the subject area in which the customer works, and without this knowledge, as a rule, people are not allowed to access the database.

Answer 2

PL/SQL is mainly distributed in the financial environment, stock exchanges, banks, etc...