1.The basic SQL aggregate function that gives the number of rows containing not null values for the given column is

2.A unit of storage that can store one or more records in a hash file organization is denoted as

3.A condition that occurs when two transactions wait for each other to unlock data is known as a(n)

4.A table where all attributes are dependent on the primary key and are independent of each other, and no row contains two or more multivalued facts about an entity, is said to be in

5.A lock that prevents the use of any tables in the database from one transaction while another transaction is being processed is called a