Oracle is considered as worlds most powerful and reliable Database System. Most of the enterprise level software are actually developed with Oracle Database.
I am an Oracle Certified Professional. To achieve this, I had to sit for three papers. Passing the first paper got me a degree of OCE and passing second got me OCA. After passing all three papers, I was awarded with OCP.
I can be right IT consultant for any consultancy also because I have OCP and can understand your needs better.