根据日期从另一个表更新mysql一个表

Question

I have a program for student attendance system and record save on mysql table like below if present then 1 and if absent then 0

Table -> attendance

uid  date       status  App
1   01/07/2013  1   
1   01/07/2013  1   
1   01/07/2013  1   
1   01/07/2013  0   
1   01/07/2013  0   
1   02/07/2013  1   
1   02/07/2013  0   
1   02/07/2013  1   
1   02/07/2013  1   
1   02/07/2013  1   
1   03/07/2013  0   
1   03/07/2013  0   
1   03/07/2013  1   
1   03/07/2013  1   
1   03/07/2013  1   
1   04/07/2013  0   
1   04/07/2013  1   
1   04/07/2013  1   
1   04/07/2013  1   
1   04/07/2013  1   

And i also have a table where student submit their leave applications like below

Table -> application

 id  uid    from            to           status
 1   1    04/07/2013    07/07/2013  approved
 2   1    11/07/2013    12/07/2013  rejected

I want that if status sets to approved then the date range given in application from 4 july to 7 july will be searched on "attendance" table and whatever the dates will be found with 0 status it will add 1 to "app" column and ignore the dates on which attendance is not taken.

Answer 1

UPDATE attendance  d
  JOIN application p
    ON d.uid = p.uid
   AND d.date BETWEEN p.from AND p.to
SET    d.status = 1
WHERE  p.status = 'approved'

Answer 2

UPDATE attendance  d
  JOIN application p
    ON d.uid = p.uid
   AND d.date BETWEEN p.from AND p.to
   AND p.status = 'approved'
SET    d.app = 1
WHERE  d.status = 0

Answer 3

This should do what you want:

UPDATE attendance a
    Set a.app=1
    WHERE a.uid IN
        (select z.uid
            FROM application z
            WHERE z.status='approved'
                AND a.date BETWEEN z.from and z.to);