No, Anna is not wrong in making this assumption. It is common for organizations to have an operational database system in place before they begin to design and build a data warehouse system.
What is database?
A database is a planned grouping of material that has been arranged and is often kept digitally in a computer network. A database management system often oversees a database (DBMS). The term "database system," which is frequently abbreviated to "database," refers to the combination of the data, the DBMS, and the applications which are connected to it. To facilitate processing and data querying, the most popular types of databases currently in use typically model their data as rows and columns in a set of tables. The data may then be handled, updated, regulated, and structured with ease. For writing and querying data, most databases employ structured query language (SQL).
To learn more about database
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