¿Cómo seleccionar las fechas de los últimos 30 días en MySQL incluso las fechas no están presentes en mysql?

Asumiendo una tabla de ejemplo simplificada table1 con los siguientes contenidos

CREATE TABLE table1 (lastUpdated datetime);
INSERT INTO table1 (lastUpdated) VALUES ('2016-03-23');
INSERT INTO table1 (lastUpdated) VALUES ('2016-03-24');
INSERT INTO table1 (lastUpdated) VALUES ('2016-03-30');
INSERT INTO table1 (lastUpdated) VALUES ('2016-03-31');
INSERT INTO table1 (lastUpdated) VALUES ('2016-04-02');
INSERT INTO table1 (lastUpdated) VALUES ('2016-03-31');

Luego, la siguiente declaración de MySQL devolverá todas las fechas en los últimos 30 días, con un recuento de 0 donde no se encuentra ninguna entrada en table1 :

SELECT lastUpdated, count(*)-1 FROM (
    SELECT date(lastUpdated) as lastUpdated FROM table1 as t1
    UNION ALL 
    SELECT curdate() - interval a day AS lastUpdated FROM (
        select 0 as a union select 1 union select 2 union select 3 union
        select 4 union select 5 union select 6 union select 7 union
        select 8 union select 9 union select 10 union select 11 union
        select 12 union select 13 union select 14 union select 15 union 
        select 16 union select 17 union select 18 union select 19 union
        select 20 union select 21 union select 22 union select 23 union
        select 24 union select 25 union select 26 union select 27 union
        select 28 union select 29
    ) as t2
) as t3 GROUP BY lastUpdated;