IN planning a database and it's related tables it is important to consider

In planning the database it is important to consider - what each table is 'about'.

Explanation: It becomes very important so that any sort of duplicate data can be avoided. These databases are the source which provides the information. It should be segregated into several subject based tables. Basically, databases provides the access to the accurate information and to provide accuracy one must be careful while creating. Every table is anyhow related to another.