Question

I have two tables, timetable and lesson_booking these are linked via timetable_id.

timetable represents timetable entries for a given day (mon, tue etc) that can be selected and used to make a booking for a client in lesson_booking

What I would like to do is get a list of timetable entries that have no bookings associated with it.( i.e. find empty timtables slots)

I can do this but my problem is with doing it for a certain date. I am having some trouble with this as the date is in the lesson_booking table and the entries I am requesting have no link to lesson_booking

Here is what I have so far:
The following will return all empty timetable entries. I want to do it for a specified date only.

I have a feeling that I need to modify the left join but i’m unsure how.

    SELECT 
        lesson_booking.booking_date,
        employee.employee_firstname, employee_lastname,
        TIME_FORMAT(start_time, '%l:%i %p') AS start_time,
        TIME_FORMAT(end_time, '%l:%i %p') AS end_time,
        lesson_type.lesson_type_name

FROM timetable
        LEFT JOIN lesson_booking ON lesson_booking.timetable_id = timetable.timetable_id
        JOIN employee ON timetable.employee_id = employee.employee_id
        JOIN lesson_type ON timetable.lesson_type_id = lesson_type.lesson_type_id
        JOIN day_name ON day_name.day_name_id = timetable.day_name_id
WHERE   ISNULL(lesson_booking_id)
    AND
    day_name = DATE_FORMAT('2010-7-5', '%W')

NOTE: there are other tables linked for employee, lesson type etc. Also, day_name is a table for days i.e monday,tuesday, wednesday etc. The where clause narows to display only timteable entries of a specified day.

Any help is greatly appreciated..

Thanks.

UPDATE:

Note: Here are twi queries. The first contains all the information I want but some extra too.. The second contains the information that I want exluded from the first. How do I combine the two to get just the data I want? Thanks.

    SELECT
    timetable.*
FROM
    timetable
    JOIN day_name ON day_name.day_name_id = timetable.day_name_id
WHERE
    day_name = DATE_FORMAT('2010-7-5', '%W');

-- exclude the following result from the above result.
SELECT
    timetable.*
FROM
    lesson_booking
    JOIN timetable ON timetable.timetable_id = lesson_booking.timetable_id
WHERE
    booking_date = '2010-07-05';

definitions for lesson_booking and timetable

    /*
SQLyog Community- MySQL GUI v8.22 
MySQL - 5.1.30-community-log 
*********************************************************************
*/
/*!40101 SET NAMES utf8 */;

create table `COLUMNS` (
    `Field` varchar (192),
    `Type` blob ,
    `Null` varchar (9),
    `Key` varchar (9),
    `Default` blob ,
    `Extra` varchar (81)
); 
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('lesson_booking_id','int(11)','NO','PRI',NULL,'auto_increment');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('client_id','int(11)','NO','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('timetable_id','int(11)','NO','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('horse_owned_id','int(11)','NO','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('transaction_id','int(11)','YES','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('booking_date','date','NO','',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('cancelled_status','int(11)','YES','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('no_show','tinyint(1)','NO','','0','');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('same_time_next_week_booking_id','int(11)','YES','MUL',NULL,'');

/*
SQLyog Community- MySQL GUI v8.22 
MySQL - 5.1.30-community-log 
*********************************************************************
*/
/*!40101 SET NAMES utf8 */;

create table `COLUMNS` (
    `Field` varchar (192),
    `Type` blob ,
    `Null` varchar (9),
    `Key` varchar (9),
    `Default` blob ,
    `Extra` varchar (81)
); 
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('timetable_id','int(11)','NO','PRI',NULL,'auto_increment');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('day_name_id','int(11)','NO','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('start_time','time','NO','',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('end_time','time','NO','',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('lesson_type_id','int(11)','NO','MUL',NULL,'');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('employee_id','int(11)','NO','MUL','0','');
insert into `COLUMNS` (`Field`, `Type`, `Null`, `Key`, `Default`, `Extra`) values('timetable_active_status','tinyint(1)','NO','','1','');

Answer 1

Use:

   SELECT tt.*
     FROM TIMETABLE tt
     JOIN day_name dn ON dn.day_name_id = ttt.day_name_id
                     AND dn.day_name = DATE_FORMAT('2010-7-5', '%W');
LEFT JOIN LESSON_BOOKING lb ON lb.timetable_id = tt.timetable_id
                           AND lb.booking_date = '2010-07-05'
    WHERE lb.lesson_booking_id IS NULL