Task: Write SQL statements to answer the following questions from the ‘assignment5’ Database: Answer all questions List all the record/s in the vendor table that do not have a value for the attribute...

Task:
Write SQL statements to answer the following questions from the ‘assignment5’
Database: Answer all questions
List all the record/s in the vendor table that do not have a value for the attribute V_STATE.
Find the customers whose balance is greater than 250 but less than 400.
Create a query based on invoice table to show a 15% increase on tax in a new column.
Show the first and last names of the customers for whom we have issued invoices.
Show the CUS_CODE of the customers for whom we DO NOT have invoices.
Show the names of the customers for whom we DO NOT have invoices
Find out how many times a customer generated an invoice – make sure the counted column heading reads “Invoices_generated” .
List the names of the customers and how many times a customer generated an invoice – make sure the counted column heading reads “N_Of_Invoices” .
Find the customers whose last name is either Dunne, Orlando or Brown and live in area 615, sort in alphabetical order by the CUS_LNAME,.