"If you're looking into building your own database ...SQLite is amazing. It has very clean and readable code, so I'd suggest using it as a reference" https://news.ycombinator.com/item?id=21041833

"I suggest SQLite because the source code is superb (seriously, some of the most readable, most logically organized and best commented C code you'll ever see)" https://news.ycombinator.com/item?id=12559301

"it never hurts to look at a good open-source codebase written in C, for example the SQLite code is worth looking at (if a bit overwhelming)" https://news.ycombinator.com/item?id=33132772