What is a key characteristic of a Unique Primary Index (UPI)?

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A Unique Primary Index (UPI) is designed to ensure that each row in a Teradata table is uniquely identifiable. This characteristic is fundamental to how data is organized and accessed within Teradata. When a UPI is defined on a table column or columns, it guarantees that no two rows can have the same value or combination of values in those indexed columns. This uniqueness constraint helps maintain the integrity of the data and assists in optimizing query performance by allowing efficient data retrieval.

By enforcing the rule of no duplicate values, a UPI helps in various operations, such as determining row access when executing queries or performing joins between tables. Unlike other types of indexing, which may allow duplicates or have different implications for data distribution, the UPI's primary goal is to ascertain that each entry remains distinct across the table, thus providing a reliable method of uniquely identifying rows.

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