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Advantages of a database over electronic files to store data

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What are the advantages of a database over electronic files to store data? What kinds of database products are used in your company?

Explain the concept of a primary key in a relational table. Could the primary key be a combination of multiple columns, or is it only in one column?

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The advantages of a database over electronic files to store data are determined. The expert explains the concept of a primary key in a relational table are determined.

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Database has many advantages over electronic files.
With database you can query and retrieve the information in short time.That is greatest power of database.
You can use for it for storing any kind of data ...

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