What is the sequence if I want to learn C/C++,.NET,JAVA,ORACLE?

Hmm...there's not really an order in which you should learn them, I don't think. Some are easy for some people to get and hard for others. I found Java really easy, but some people in my class struggled with it, but they thought C++ was really easy. I think you'll just have to experiment with them and see which one you pick up quicker. I know that for the sake of my college, students learn Java and then C++. The very first language they learn is Python. As far as Oracle goes, I've never worked with it, personally, but my mother did when she had her computer programming job. From what she said, it didn't seem too hard to learn Oracle after knowing C++, but she's weird, so that could just be her (then again, she had trouble learning Java and still doesn't know it, either, so it really does depend on the person).

java will be the most useful to learn first. its pretty much the language of the future. the syntax for C++ and java are pretty similar, so id suggest learning that next. html is also a good language to learn, theres good money in making websites for people. i dont know about oracle.