Published May 7, 2021Updated Jul 13, 2022
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CASE command is a logical test that returns different output based on the conditions of each statement and closes with an
CASE WHEN this_condition THEN this_result WHEN that_condition THEN that_result ELSE fallback_result END;
The result will come from the first
WHEN .. THEN ... statement that evaluates as “True”. If none of these statements are “True”, a
fallback_result from the
ELSE clause will be returned. If there is no
ELSE clause and none of the
WHEN .. THEN ... statements evaluate to “True”,
NULL is returned.
The following example showcases the
CASE command returning output based on several conditions:
SELECT student_name AS 'Student',overall_gpa AS 'GPA',CASEWHEN overall_gpa > 3.0 THEN "Exceptional grades, keep up the good work!"WHEN overall_gpa BETWEEN 2.0 AND 3.0 THEN "Good job! Study hard this term!"ELSE "You're at risk of academic probation, seek help if needed."ENDFROM students;
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