Writing optimal SQL requires leveraging advanced analytic functions, hierarchal queries, and row-limiting features. Analytic Functions

Traditionally, high-volume data inserts (like bulk loads) required manual or scheduled statistics gathering ( DBMS_STATS ) to avoid poor query execution plans.

A portable collection of schemas and schema objects that appears to an application as a separate, independent database.

Finally, open the generated file ( employee_report.txt or the converted PDF) to review your report.

To create a PDF directly, you might consider using Oracle's UTL_FILE or SPOOL with a tool that converts text to PDF, or third-party reporting tools like Oracle BI Publisher, or external tools like Crystal Reports.

Visit https://docs.oracle.com/en/database/oracle/oracle-database/19/ and download the SQL Language Reference PDF now.