Advanced SQL and PL / SQL

Advanced SQL and PL / SQL" Please respond to the following:

• Extracting and interpreting data can be very valuable to an organization. Describe the importance of using sub queries in a database system. Provide at least two business case scenarios to support your response.  
• A good IT professional is able to be versatile in SQL programming styles. Identify at least two possible advantages of utilizing PL / SQL instead of standard SQL Syntax. Explain whether either syntax provides enhanced code processing capabilities with examples. Note: The Strayer Oracle Server may be used to test and compile the SQL Queries developed.