SQL para convertir string separados por comas en una tabla

SET @tu_string = 'Enero,Febrero,Marzo,Abril,Mayo,Junio,Julio,Agosto,Septiembre,Octubre,Noviembre,Diciembre';

SELECT 

    SUBSTRING_INDEX(SUBSTRING_INDEX(@tu_string, ',', numbers.n), ',', -1) AS columna,

    @correlativo := @correlativo + 1 AS correlativo

FROM (

    SELECT

        (@rn := @rn + 1) AS n

    FROM

        (SELECT 0 UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) t1,

        (SELECT 0 UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) t2,

        (SELECT 0 UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) t3,

        (SELECT 0 UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) t4,

        (SELECT @rn := 0) t5

    WHERE @rn < LENGTH(@tu_string) - LENGTH(REPLACE(@tu_string, ',', '')) + 1

) numbers, (SELECT @correlativo := 0) AS init

ORDER BY correlativo;