Which of these actions is enhanced by the use of PROC FEDSQL?

PROC FEDSQL is designed to provide a SQL interface for data manipulation within the SAS environment, facilitating both data processing and analysis. This procedure allows users to perform tasks such as querying, filtering, and aggregating data across various data sources, including SAS data sets and other relational databases.

Using PROC FEDSQL, you can create powerful queries that can join multiple tables, calculate new columns, and summarize data in a way that enhances analytical capabilities. This means it effectively supports complex data processing and can also enable significant analytical insights by executing SQL code that can interact seamlessly with the SAS environment.

While data extraction and loading operations can certainly involve SQL queries, PROC FEDSQL primarily excels in processing and analyzing data, allowing users to leverage SQL's strengths to work with massive data sets efficiently. Data visualization typically occurs as a subsequent step after processing and analysis, using other SAS procedures or visualization tools, and thus is not the primary enhancement provided by PROC FEDSQL.