What considerations are taken into account when designing database table structures?

When designing database table structures, the following aspects are considered:

• Data integrity: using primary and foreign keys to maintain relationships between tables.
• Performance: indexes to speed up queries, balancing normalization and denormalization.
• Scalability: the ability to extend the structure without significant changes.
• Data types: choosing appropriate types for storing information considering size and format.
• Business logic: reflecting domain requirements in the table structure.
• Security: restricting access to data at the table or column level.

For example, when designing a user table, it is important to define unique fields (email, username), as well as relationships with other entities, such as roles or orders.