A relational database looks for relativity in the database. This means that it has a set of tables with predefined meanings and it matches data using some common attributes found in the data set.
A flat file database restricts user to define the data types and columns one table at a time. Any plain text file could be an example of this. On the other hand relational database allows data types and columns to be defined for multiple tables and thereby permitting a relationship between them.
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