4. Create an INVOICE_2 table from the INVOICE table using a select statement.
5. Rename the INVOICE_2 table to INVOICE_3.
6. Add a comment to the INVOICE_3 table definitions describing the tables.
7. Drop the ITEMID column from the INVOICE table.
8. Create an INVOICE_4 table using a subquery based on the structure of the INVOICE table. Include only the ORDID, DESCRIPTION, PRODID and QTY columns. Name the columns in your new table INV ID, DESCRIPT, PROD ID and QUANTITY, respectively.
9. Add a first row of data to the INVOICE table with data of your own choosing. Do not list the columns in the INSERT clause.
10. Populate the INVOICE table with the sample data. You are to create the values to enter into the table. This time, list the columns explicitly in the INSERT clause.
ORDID, DESCRIPTION, ITEMID, ACTUALPRICE, QTY, ITEMTOT, PRODID
11. Create a script named LOAD_DATA_(your initials).sql to load rows into the INVOICE table interactively. Prompt the user for the values . Specify a default value for the QTY.
12. Populate the table with the four rows of sample data by running the script that you created.
13. Change the value for one of the DESCRIPTIONS.
14. Create a PRIMARY KEY constraint on the INVOICE table using the ORDID column. The constraint should be named at creation as a named table level constraint.
15. Add a named table level foreign key reference on the INVOICE table that will ensure that the PRODID is not assigned to a nonexistent PRODUCT.
16. Modify the INVOICE_3 table. Add an ORD_DATE column of DATE datatype.
17. Modify the INVOICE table. Add a CHECK constraint to prevent any ACTUALPRICE greater than what you think is a reasonable level.
18. Modify the INVOICE table by making one of the columns NOT NULL.
19. Create a view called INVOICE_View based on four columns in the INVOICE table. Use SQL*PLUS formatting commands to create column headings for the four columns.
20. Using your view INVOICE_View, enter a query to display values for three of the four columns included in the view.
21. Create a view named INV_VIEW_QUERY that does not allow an invoice DESCRIPTION to be changed through the view.
22. Create a sequence to be used with the primary key column of the INVOICE table. The sequence should start at 1000 and have a maximum value of 2000. Have your sequence increment by a single number. Name the sequence INVOICE_SEQ. Do not allow the sequence to cycle or cache.
23. Write an interactive script to insert a row into the INVOICE table. Name your script
Be sure to use the sequence that you created for the primary key column. Create a customized prompt to enter the DESCRIPTION. Execute your script.
24. Create a synonym for the INVOICE table.
25. Write a query to display the three columns of data for all employees with the same MANAGER_ID as Grant .
26. Create a query to display the employee number, last name and hire date for all employees who have a salary greater than the average salary. Sort the results in descending order of salary.
27. Create a report containing the employee name, address, city, and each employee’s salary. Label the columns with a different name than the column name. Break on the individual department numbers. Create a spool file for this problem.
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