SELECT-WHEN structures (data step only)
The full form of Select is:
SELECT (select-expression);
WHEN (when-expression, when-expression, ...) statement;
...
[ WHEN (when-expression, when-expression, ...) statement; ]
OTHERWISE statement;
END;
SAS first evaluates the select-expression.
Then, each when-expression is evaluated and compared for equality to the value of the select-expression. The first equality that is true causes the execution of the associated statement. If none are true, the statement in the OTHERWISE is executed.
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