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.
Frequency distribution: a table of outcomes (response categories) of a variable and the number of times [tally or count] each outcome is observed. A frequency distribution shows the total number of persons responding to each of the variableâs K categories. â¢Tally (count) frequencies by hand or by calculator; or â¢Use SPSS on GSS to tally frequencies & a print table