Final answer:
When using the declarative capabilities of the Force.com platform to build custom applications, writing SQL queries to create reports is not necessary.
Step-by-step explanation:
When using the declarative capabilities of the Force.com platform to build custom applications, one action that is NOT necessary is writing SQL queries to create reports. The Force.com platform provides a feature called Reports and Dashboards that allows users to create reports and dashboard components without writing any SQL queries. This feature provides a user-friendly interface for generating reports and visualizing data.