1. A join operation: a) brings together data from two different fields. b) causes two tables with a common domain to be combined into a single table or view. c) causes two disparate tables to be combined into a single table or view. d) is used to combine indexing operations. 2. A join that is based upon equality between values in two common columns with the same name and where one duplicate column has been removed is called a(n) : (a) hatural join. b) equi- join. c) multivariate join. d) inner join. 3. A join in which rows that do not have matching values in common columns are still included in the result table is called a(n): a) natural join. b) equi-join. c) outer join. d) union join. 4. In which of the following situations would one have to use an outer join in order to obtain the desired results? a) A report is desired that lists all customers who placed an order. b) A report is desired that lists all customers and the total of their orders? c) A report is desired that lists all customers with and without orders for the total of their orders d) There is never a situation that requires only an outer join. 5. One major advantage of the outer join is that: a) information is easily accessible. b) information is not lost. c) the query is easier to write. d) all of the above