PROC SQL: Conditional Branching with CASE-WHEN Expressions

 

In certain scenarios, you may want your SQL logic to branch in different directions depending on the value of a specific column or expression. That's where the CASE expression comes in! The CASE-WHEN structure is not limited to SELECT queries; it can also be used in INSERT, UPDATE, and DELETE statements, giving you flexible control over how data is handled and transformed. 

Whether you're customizing output, transforming data, or applying business rules, CASE expressions offer a clean and readable way to handle conditional logic within your SQL commands. In this tutorial, we'll explore how to write SQL commands that behave differently based on defined conditions, using PROC SQL in SAS.

Conditional Expressions

Conditional expressions are simply about selecting one path among multiple paths during program execution. For example, when querying "

PROC SQL;
    SELECT column_1, column_2, ...
    FROM table_1
    WHERE condition
    GROUP BY column_group
    HAVING group_condition
    ORDER BY column_order;
QUIT; 

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