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CREATE TABLE db_project (Date_of_entry DATE, Hours_worked TIME);
INSERT INTO db_project VALUES ('2019-02-04', '03:45:00'), ('2019-02-08', '03:12:05'), ('2019-02-15', '03:08:57')
select TIME_FORMAT(SUM(TIME_TO_SEC(Hours_worked)), '%H:%i:%s') from db_project
TIME_FORMAT(SUM(TIME_TO_SEC(Hours_worked)), '%H:%i:%s')
null
SELECT TIME_FORMAT(SEC_TO_TIME(SUM(TIME_TO_SEC(Hours_worked))), '%H:%i:%s') AS Total FROM db_project WHERE Date_of_entry BETWEEN '2019-02-04' AND '2019-02-15'
Total
10:06:02