database for c++ and opencv

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C++

database

OpenCV

hi
i dont know much about databas and i know it built from many tables. i am trying to write one application about image-processing which uses from opencv and neural-networks algorithms. i must use database for store images for comparing those with new images capturing by camera .
i want to know which type of databases are good for me and also i want to learn something that i can use it for larger and complicated than programs in future .