Write SQL statements to answer the following questions from the ‘assignment5’Database: Answer all questions

1. List all the record/s in the vendor table that do not have a value for the attribute V_STATE.
2. Find the customers whose balance is greater than 250 but less than 400.
3. Create a query based on invoice table to show a 15% increase on tax in a new column.
4. Show the first and last names of the customers for whom we have issued invoices.
5. Show the CUS_CODE of the customers for whom we DO NOT have invoices.
6. Show the names of the customers for whom we DO NOT have invoices
7. Find out how many times a customer generated an invoice – make sure the counted column heading reads “Invoices_generated” .
8. 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” .
9. 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,.
10. Add a new attribute called ‘email_address’ to ‘emp’ table and use data type and length ‘VARCHAR-20’.
11. Add a new row/record to the `customer` table to include your actual student ID in the CUS_CODE, your lastname as the CUS_LNAME` and your firstname as CUS_FNAME. Add any other details in the other fields.
12. Delete all the vendors in the FL state.

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