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SQL CASE statement is used to provide conditional type of logic in this syntax we are using the if else and then normal SAS no need to use the case statement but in case of proc SQL case statements are required for performing the logical operation. The CASE statement in SQL is used to check conditions and perform task on each row while selecting data. The syntax of case always starts with CASE keyword and ends with the END keyword followed by column names alias. The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else-statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in ELSE clause. If there is no else part and no conditions are true, it returns NULL.

Syntax of CASE statement

    WHEN condition1 THEN result1
    WHEN condition2 THEN result2
    WHEN conditionN THEN result
    ELSE result

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