SELECT
Student.StudentID,
student.`Name`,
attendance.Date,
CASE
WHEN attendance.StudentID IS NOT NULL THEN
'Present'
ELSE
'Absent'
END AS Attendance_Status
FROM
student
LEFT JOIN attendance ON student.StudentID = attendance.StudentID
给我这个结果
我怎样才能得到类似这样
结果
您是否希望在MySQL或PHP中执行此操作? – Sean 2015-04-02 20:48:01
@Sean我正在构建一个Web应用程序,所以我将在PHP中做这件事 – 2015-04-02 20:49:37