Which of the following databases can contain multiple tables that are joined logically?

A relational database is structured to allow the organization of data into one or more tables, which can be related to each other through the use of keys. This design facilitates complex queries and data manipulation by using JOIN operations to combine records from different tables based on shared fields.

The ability to join tables logically is a defining characteristic of relational databases, allowing for efficient data management and retrieval by making it possible to associate related data stored in separate tables. This ties various types of data together, enabling comprehensive reports and analyses without redundancy.

In contrast, flat file databases consist of a single table or file, lacking the capability to support multiple interconnected tables. Hierarchical databases organize data in a tree-like structure, only allowing one-to-many relationships which limits their ability to handle complex queries across multiple tables. Network databases resemble hierarchical databases but enable more complex relationships; however, they still do not support the same level of logical table joining as relational databases do. Thus, the relational database stands out by providing the flexibility and power required for extensive data manipulation and logical connections between tables.