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If data exists in the field print, else don't
#4

[eluser]garymardell[/eluser]
I'm not going to write any code currently but give you a idea of how i would do it.

Have a table called student, a table called address and a table called student_address. This is because one student may require many addresses and one address may belong to many students. The student_address table allows this.

The idea is to include where the primary key and foreign keys will be.

Student table
id | primary key
name|
...

Address table
id | primary key
name|
...

student_address table
student_id | composite key
address_id | composite key

Together act as a primary key.

Now to get all the students, you will want to select everything from the students table and from the address table.
Then join the student_address table where student.id = student_address.student_id
And then now join address table where student_address.address_id = address.id

This will return the addresses related to each student, this setup would potentially allow more than 2 addresses for a student (some complicated arrangement maybe.) or just a single address.


Messages In This Thread
If data exists in the field print, else don't - by El Forum - 07-01-2009, 05:00 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 05:28 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 06:15 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 06:24 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 06:36 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 06:52 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 09:00 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 09:12 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 09:13 PM
If data exists in the field print, else don't - by El Forum - 07-01-2009, 09:50 PM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 03:20 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 03:29 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 03:40 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 05:51 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 08:02 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 08:16 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 08:22 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 08:31 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 08:34 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 09:16 AM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 01:07 PM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 01:22 PM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 01:23 PM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 03:29 PM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 03:37 PM
If data exists in the field print, else don't - by El Forum - 07-02-2009, 05:09 PM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 12:44 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 12:55 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 03:58 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 08:01 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 08:16 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 09:00 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 09:33 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 09:49 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 10:01 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 10:08 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 11:01 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 11:08 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 11:38 AM
If data exists in the field print, else don't - by El Forum - 07-03-2009, 11:53 AM



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