displaying all table data mysql [closed]

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Closed 9 years ago.

I have 6 tables which all contain student information. table names: student details, doctor details, admission details, previous_school, fathers details, mothers details. each of these tables contain an unique ID.

To bring all these tables into one i have a student_info table which contains all the id's from the above 6 tables. these are linked to the unique id's in the corresponding table.

I need to display all student information, i know i would use left join and right join, I just am not sure how mysql reads the id in student_info table and grabs all the information from the corresponding table allowing the user to see all the student information in one form.

thankyou in advance.

Answer 1

EDIT: http://sqlfiddle.com/#!2/c5489/2 (working example)

You don't need to put all of the ids in each table, rather each table would have its own primary key ID - guaranteed to be unique, and you would most likely join each table using an inner join

Table A(user_id int, user_name varchar(255))
Table B(student_id int, student_email varchar(255))

And then select the data you want, by using the relating ID's to join:

Select user_name from TableA
INNER JOIN TableB ON
TableA.user_id = TableB.student_id

Answer 2

You have to specify the joins to make this work:

select * from student, student_info where student_info.student_id = student.id

This tells the server to return all information from both tables, where the student id is matched by the student info's stored student id.

Here, I'm assuming that the student is a 1:many with student_info (where there is at least one, but can be multiple student info rows per student info).