DBMS is data base management system. It the collection of data and this data is stored at one place. There are plenty of data is present on the website if someone is registering on the website. So, it is necessary to store this data somewhere, hence it is the database where all the data is stored and organised. This organised can be easily updates, it can be easily modified, it can alter, it can delete and it can retrieve anytime and that too very easily. Database design language is the language of database that is used in storing the data, modifying the data, updating the data, and deleting the data. Data is stored in the form of tables in the database. There are lots of tables in the database, so there must be some unique thing about each table and every entry made in the table. So, the unique think that needs to identify every entry uniquely is called primary key. There are various other keys also like primary key, candidate key, foreign kay, alternate key, super key, composite key, compound key, and surrogate key. These are some keys that present in the tables of the database. So according to given question, if there are primary key, alternate key, foreign key present in the table, the other entities can be any of the above stated keys.
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