When solving a coding problem you should try to read the question more than one time until you understand it 100%. Then, the next step is to start white boarding the problem and try to plan your ideas out. Finally, you should write out pseudocode and then actually code the problem out.
SQL databases are primarily called relational database. Whereas, NoSQL databases are primarily called the non-relational database. Whenever you want to create an application where there will be a relationship between the tables, like one-to-many or many-to-many or one-to-one, then you can go with the SQL database. On the other hand, if the tables do not have any relations then you can go with the NoSQL database choice.
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