Database:
As of now, I've only had one class specifically geared towards relational databases. Through that course I learned about relationships between data sets, such as one-to-one, one-to-many, and many-to-many. As well as how to implement these relationships with primary and foreign keys. Although I've only had the one course, I have had to flex my knowledge of SQL on several occasions to integrate databases with Java and web projects for other classes. I'm also gaining experience with a NoSQL database in MongoDB for a course I'm taking that revolves around implementing the MEAN stack.
C and CPP:
I have a pretty mixed bag of C++ experience, including programming micro-controllers such as the Arduino. I have also completed an introductory course to C++ which helped develop an understanding of syntax and standard library functions. Currently, I'm expanding my knowledge of C++ through a Data Structures course where I design and implement fundamental structures such as arrays, linked lists, trees, etc...