Title: Existential Moments in Database Programming: SAS® PROC SQL EXISTS and NOT EXISTS Quantifiers, and More
Abstract: Existential and universal quantifiers have a key role in SAS/Base Version 9.1.3 PROC SQL programsespecially UPDATE’s—yet, tend to baffle even experienced database programmers. The IN, EXISTS, and ALL operators put complex table look-up operations in the basic framework of WHERE clause logical conditions. Difficult problems for SAS Data step programmers, such as searches for data patterns in related tables or in different rows within the same table, become easier for those who understand these operators. (Even a caveman can learn to use of these logical quantifiers.) Carefully chosen examples illustrate both the need for existential quantifiers in database programming and methods for implementing them in SAS programs.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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