The BalanceDue in the output of this statement is called a derived or calculated column because it is not defined in the Invoices table but in this statement. In other words, there is no BalanceDue data can be found in the Invoices table. Assume that, there are some invoices in the Invoices table, their PaymentTotal or CreditTotal or both have no data value for some reasons. Discuss, for these invoices, what will be the reasonable value of BalanceDue at the output of this statement and explain why.

In the 10th grade, i was teamed up in a group of four. our project was on modern history. altho it seemed super hard for many of us. patrick fleming  took charge and showed us the understanding of this project.  his leadership showed great ethics and it taught me, personally, how to others understand, not just to show them, but explain it thoroughly. and altho he was a great teacher i would have changed a few things. one being his attitude. many times he would get frustrated and impatient with the group.  i think  a leader i would have done exactly  what he did but with much more patience and be there more to explain. such as lunch  learning. and giving everybody a chance to try to explain it in their  head. 

Answer( inelastic);