0
SELECT
Student.id,
Student.first_name,
Student.last_name,
count(`Attendance`.`id`) as total
FROM `karate`.`attendances` AS `Attendance`
RIGHT JOIN `karate`.`students` AS `Student` ON (`Attendance`.`student_id` = `Student`.`id`)
WHERE 1
AND `Attendance`.`attendance_date` BETWEEN '2012-07-01' AND '2012-07-31'
AND (Student.active = '1')
AND (Student.type = 'student')
GROUP BY `Student`.`id`
ORDER BY total ASC
我希望所有的學生記錄中在指定的日期範圍內有出勤總人數,但它只顯示那些有出勤率的學生的兩個記錄。 但是 如果我們刪除日期檢查條件它工作正常。正確加入不起作用
在此先感謝
遺憾地說,但這不能正常工作,仍顯示出只參加學生(?: – 2012-07-27 08:39:54
您可以發佈更新的查詢在你原來的問題 – 2012-07-27 08:44:10
SELECT Student.id,學生(出勤)''''''作爲總數從'karate'.'students'作爲'學生'RIGHT JOIN'karate'.'attendances'作爲'考勤'ON('考勤'。 'student_id' ='Student'.'id')WHERE 1 AND(('Attendance'.'attendance_date' is NULL or'Attendance'.'attendance_date' BETWEEN'2012-07-01'AND'2012-07-31') AND(Student.active ='1')AND(Student.type ='student')GROUP BY'Student'.'id' ORDER BY total ASC – 2012-07-27 08:46:42