Yes of course before you start your work and make your hands dirty in database designing, it is very important to gather the complete requirements of the system. Because when you’re developing something from the start, it is easy to design it according to the system requirement. But it would be difficult to change the things in the existing system. So if you’ve already made something of your database part and then you notice that something is remaining which it was not clear before then would be so difficult to change the things in the existing system.
source https://www.c-sharpcorner.com/article/requirement-gathering-and-creating-initial-er-model/
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