If you haven't learned C/C++ yet, then you'll need to learn as much as you can before trying to integrate the database stuff. here's a decent, albeit somewhat brief, C/C++ tutorial. For reference, here's a decent tutorial on using ODBC with C.
C language is a base of programming and it is also called machine level programming while c++ is an advance version of c language and it is also called object oriented programming. First start to understand logic of any program how it works and how to write syntax of that logic by using c or c++ language.SQL is related to database and it connectivity. It is easier to learn when you have idea about c and c++ language.
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