A condition in a relationship that prevents a record from being joined to a nonexistent value in another table is known as ________

To determine percentage of absences in the ranges 0, 1 to 5, and more than 6, you would use the FREQUENCY function

Indicate whether the statement is true or false

When it’s not known in advance how many times a set of statements will be repeated, a(n) ________ value can be used to terminate the iteration.

Fill in the blank(s) with the appropriate word(s).