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Exercises 3

(First 4 queries need to be run only and do not require any script)

5- Write a SELECT statement that returns three columns from the Vendors table:
vendor_name, vendor_contact_last_name, vendor_contact_first_name. Then, run this statement.

Next, add code to this statement so it sorts the result set by the last name and then the first name. Then, run this statement again. This is a good way to build and test a statement, one clause at a time.

6- Write a SELECT statement that returns one column from the Vendors table named
full_name. Create this column from the vendor_contact_first_name and
vendor_contact_last_name columns, and format it like this: last name, comma, space, first name
(for example, “Doe, John”). Next, sort the result set by the last name and then the first name. Then, filter the result set for contacts whose last name begins with the letter A, B, C, or E.

7- Write a SELECT statement that returns four columns from the Invoices table named Due Date, Invoice Total, 10%, and 10%. These columns should contain this data:

Due Date The invoice_due_date column
Invoice Total The invoice_total column
10% 10% of the value of invoice_total
Plus 10% The value of invoice_total plus 10%

(For example, if invoice_total is 100, 10% is 10, and 10% is 110.) Next, filter the result set so it returns only those rows with an invoice total that’s greater than or equal to 500 and less than or equal to 1000. Then, sort the result set in descending sequence by invoice_due_date.

8- Write and run a SELECT statement that returns four columns from the Invoices table named
Number, Total, Credits, and Balance Due. These columns should include this data:

Number The invoice_number column
Total The invoice_total column
Credits Sum of the Paympayment_total and credit_total columns
Balance Due Invoice_total minus the sum of payment_total and creadit_total

Next, filter for invoices with a balance due that’s greater than or equal to \$500. Then, sort the result set by the balance due in descending sequence. Last, use the ROWNUM pseudo column so the result set contains only the rows with the 10 largest balance dues.

9- Write a SELECT statement that returns the balance due and payment date from the Invoices table, but only when the payment_date column contains a null value. Then, modify the WHERE clause so it returns any invalid rows (rows in which the balance due is zero and the payment date is null).

10 – Use the Dual table to create a row with these columns:

Starting Principal Starting principle which should be equal to \$51,000

New Principal Starting principal plus a 10% increase

Interest 6.5% of the new principal

Principal + Interest The new principal plus the interest (add the expression you used for the new principal calculation to the expression you used for the interest calculation)

Now, add a column named “System Date” that uses the TO_CHAR function to show the results of the SYSDATE function when it’s displayed in this format:

‘dd-mon-yyyy hh24:mi:ss’

This format will display the day, month, year, hours, minutes, and seconds of the system date, and this will show that the system date also includes a time. (You should be able to figure out how to use the TO_CHAR and SYSDATE functions by studying figures 3-7.)

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