Mysql 溶解第二个select语句
我得到了以下同样有效的查询Mysql 溶解第二个select语句,mysql,select,Mysql,Select,我得到了以下同样有效的查询 SELECT date, duration, educationDepartment, yearOfTraining, completedtasks FROM programm_completedtask WHERE date BETWEEN '2014-08-05' AND '2014-08-08' AND trainee_id = (SELECT id FROM programm_trainee WHERE username = 'Markus
SELECT date, duration, educationDepartment, yearOfTraining, completedtasks
FROM programm_completedtask
WHERE date BETWEEN '2014-08-05' AND '2014-08-08'
AND trainee_id =
(SELECT id FROM programm_trainee WHERE username = 'Markus');
是否可以执行其他操作来代替第二个select语句?我只想选择一次。使用内部联接
SELECT p.date, p.duration, p.educationDepartment, p.yearOfTraining, p.completedtasks
FROM programm_completedtask as p
INNER JOIN programm_trainee as pt on p.trainee_id = pt.id AND pt.username = 'Markus'
WHERE p.date BETWEEN '2014-08-05' AND '2014-08-08'
或
SELECT p.date, p.duration, p.educationDepartment, p.yearOfTraining, p.completedtasks
FROM programm_completedtask as p
INNER JOIN programm_trainee as pt on p.trainee_id = pt.id
WHERE p.date BETWEEN '2014-08-05' AND '2014-08-08'
AND pt.username = 'Markus'