MySQL में पिछले 30 दिनों की तिथियों का चयन कैसे करें, यहां तक ​​​​कि तिथियां भी MySQL में मौजूद नहीं हैं?

एक सरलीकृत उदाहरण तालिका मानते हुए table1 निम्नलिखित सामग्री के साथ

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');

फिर निम्न MySQL स्टेटमेंट पिछले 30 दिनों की सभी तारीखों को 0 की गिनती के साथ लौटाएगा, जहां table1 में कोई एंट्री नहीं मिली है। :

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;