1. In the context of the select list, what is an alias? Why might you use one? 2. Name three of the SQL DDL statements discussed in this chapter and explain their purpose. 3. List the four main...

1. In the context of the select list, what is an alias? Why might you use one?

2. Name three of the SQL DDL statements discussed in this chapter and explain their purpose.

3. List the four main characteristics of a column definition in a create table statement and explain them.

4. Explain the purpose of the RESTRICT and CASCADE keywords in the drop statement.

5. Explain the purpose of the SQL check constraint and unique constraint