mysql join with conditional

Posted by Conor H on Stack Overflow See other posts from Stack Overflow or by Conor H
Published on 2010-05-28T23:11:14Z Indexed on 2010/05/28 23:22 UTC
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Hi There,

I am currently working on a MySQL query that contains a table:

TBL:lesson_fee
-fee_type_id (PRI)
-lesson_type_id (PRI)
-lesson_fee_amount

this table contains the fees for a particular 'lesson type' and there are different 'fee names' (fee_type). Which means that there can be many entries in this table for one 'lesson type'

In my query I am joining this table onto the rest of the query via the 'lesson_type' table using:

lesson_fee 
INNER JOIN (other joins here)
ON lesson_fee.lesson_type_id = lesson_type.lesson_type_id

The problem with this is that it is currently returning duplicate data in the result. 1 row for every duplicate entry in the 'lesson fee' table.

I am also joining the 'fee type' table using this 'fee_type_id'

Is there a way of telling MySQL to say "Join the lesson_fee table rows that have lesson_fee.lesson_type_id and fee_type_id = client.fee_type_id".

UPDATE: Query: SELECT lesson_booking.lesson_booking_id,lesson_fee.lesson_fee_amount FROM fee_type INNER JOIN (lesson_fee INNER JOIN (color_code INNER JOIN (employee INNER JOIN (horse_owned INNER JOIN (lesson_type INNER JOIN (timetable INNER JOIN (lesson_booking INNER JOIN CLIENT ON client.client_id = lesson_booking.client_id) ON lesson_booking.timetable_id = timetable.timetable_id) ON lesson_type.lesson_type_id = timetable.lesson_type_id) ON horse_owned.horse_owned_id = lesson_booking.horse_owned_id) ON employee.employee_id = timetable.employee_id) ON employee.color_code_id = color_code.color_code_id) ON lesson_fee.lesson_type_id = lesson_type.lesson_type_id) ON lesson_fee.fee_type_id = client.fee_type_id WHERE booking_date = '2010-04-06' ORDER BY lesson_booking_id ASC

How do I keep the format(indentation) of my query?

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