The database commonly uses an index range scan to access selective data. The selectivity is the percentage of rows in the table that the query selects, with 0 meaning no rows and 1 meaning all rows. Selectivity is tied to a query predicate, such as WHERE last_name LIKE 'A%', or a combination of predicates.
Types of Distribution: Intensive, Selective and Exclusive Distribution. Some of the important types of distribution in international market are 1. Intensive 2. Selective and 3. Exclusive distribution.
Distribution Diagram. A distribution diagram shows the relative concentrations of the different forms of an element in solution as a function of pH. This type of diagram is generated from experimentally measured concentrations of the species present plotted versus pH. Predominance Diagram.