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 t3.site_id, t3.project_id, t3.name, t2.name
from tasks t1
left join schedules t2 on t1.schedule_id = t2.id
left join workbooks t3 on t1.obj_id = t3.id and obj_type = 'Workbook'SK
 t3.site_id, t3.project_id, t3.name, t2.name
from tasks t1
left join schedules t2 on t1.schedule_id = t2.id
left join workbooks t3 on t1.obj_id = t3.id and obj_type = 'Workbook'EL
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