IF CASE WHEN

IF

SELECT `Clothing ID`,
	IF (Age >= 30, 'O' , 'X') AS 'if_result'
FROM dataset2;

CASE WHEN END

SELECT `Clothing ID`,
	CASE WHEN age >= 30 THEN 'O'
    WHEN age < 30 THEN 'X'
    END AS 'case_result'
from dataset2;