What are the example of external database?

A simple example for a database would be the record of all employees of CNN international on their payroll

A telephone directory. It has a bunch of information but it is all sorted efficiently to be able to find exactly what you need without having to read the whole phone book.

mathsict

A database is an accumulation of data that can be simply organized in rows and columns. Examples of databases would be address book and accounting ledger.

In an inventory database, for example, a purchasing query could be done for all merchandise at or near the inventory minimum of the particular item.