mysql PHP join - syntax issue -

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i trying join 3 tables keep getting error query. not sure doing wrong. must doing incorrect syntax not quite sure wrong. 

select project_timecard_tasks.datetime,         project_timecard_tasks.total_hours,         project_timecard_tasks.user_id,         project_timecard_tasks.task_id,         project_timecard_tasks.project_id,         users.user_id,         users.firstname,         users.lastname,         tasks.id,         tasks.taskname   project_timecard_tasks   join project_timecard_tasks on project_timecard_tasks.user_id = users.user_id   , project_timecard_tasks.task_id = tasks.id   project_timecard_tasks.project_id = '$jobnumber'

your join statement little wonky. try this:

select project_timecard_tasks.datetime,         project_timecard_tasks.total_hours,         project_timecard_tasks.user_id,         project_timecard_tasks.task_id,         project_timecard_tasks.project_id,         users.user_id,         users.firstname,         users.lastname,         tasks.id,         tasks.taskname   project_timecard_tasks   join users on project_timecard_tasks.user_id = users.user_id   join tasks on project_timecard_tasks.task_id = tasks.id   project_timecard_tasks.project_id = '$jobnumber'

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