Which of the following statements is inherently true about USQL?

The statement that only one table is allowed per SELECT in USQL is inherently true because USQL is designed to work primarily with one dataset in a single query context at any given time. While it does support some advanced functionality, such as integrating data processing across multiple datasets, the fundamental operation of a SELECT statement traditionally focuses on a single table or data source, particularly in its simplest form. This design aligns with the language's goal of simplifying data extraction and transformation processes.

Other choices, while they may speak to various capabilities or features associated with SQL-like languages, do not accurately reflect the core operation of USQL when it comes to its basic SELECT functionality. The intent behind USQL is to streamline operations, and thus, limiting simultaneous table references helps maintain that clarity and efficiency.