September 2004
Beginner to intermediate
388 pages
6h 34m
English
Content preview from PROC SQL: Beyond the Basics Using SAS®
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4.5. Summary
A CASE expression is a PROC SQL feature that can be used to evaluate whether a particular condition has been met (see section 4.3).
A CASE expression can be used to process a table’s rows (see section 4.3).
A single value is returned from its evaluation of each row in a table (or view) (see section 4.3).
Logic conditions can be combined using the logical operators AND and OR (see section 4.3.3).
A missing or null value is returned when an ELSE expression is not specified and each when-condition is “false” (see section 4.3.3).
A missing value is not the same as a value of 0 (zero) or as a blank character since it represents a unique value or a lack of a value (see section 4.3.3).
PROC SQL can be used with the SAS macro facility to perform ...
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