sql - I want project_manager column which is not null -

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query sql :: want project_manager column not null alias name. want query having null in project_manager. having trouble getting required query(project_manager having null). how can ?

select t_gps_applications.application_id,            t_gps_applications.application_name,          (select u.first_name || ' ' || u.middle_name || ' ' || u.last_name               tas.t_users u, t_gps_app_properties ap              to_char(u.user_id) = ap.property_value                , ap.property_name = 'project_manager'                , ap.application_id = t_gps_applications.application_id)                                        project_manager,             decode(t_gps_applications.visible_flag,                   'false',                   'closed',                   decode((select count(1)                            t_gps_instances gi                           gi.application_id =                                 t_gps_applications.application_id),                          0,                          'not started',                          decode((select count(1)                                   t_gps_instances       gi,                                        t_gps_workflow_states ws                                  gi.application_id =                                        t_gps_applications.application_id                                    , gi.instance_present = 1                                    , (gi.active = 1 or gi.active null)                                    , gi.current_state_id = ws.state_id                                    , ws.state_descriptor not in                                        ('workflow end', 'and state')),                                 0,                                 'completed',                                 'running'))),             t_gps_applications.visible_flag       stategps.t_gps_applications   t_gps_applications,            stategps.t_gps_app_properties t_gps_app_properties      t_gps_applications.application_id =            t_gps_app_properties.application_id        , (t_gps_app_properties.property_value = 'true' ,             t_gps_app_properties.property_name = 'projectplan_application');            select *   t_gps_app_properties ap;

have tried not exists condition ? have no database try though...

i took liberty remove project_manager column, return null value

select t_gps_applications.application_id,            t_gps_applications.application_name,            decode(t_gps_applications.visible_flag,                   'false',                   'closed',                   decode((select count(1)                            t_gps_instances gi                           gi.application_id =                                 t_gps_applications.application_id),                          0,                          'not started',                          decode((select count(1)                                   t_gps_instances       gi,                                        t_gps_workflow_states ws                                  gi.application_id =                                        t_gps_applications.application_id                                    , gi.instance_present = 1                                    , (gi.active = 1 or gi.active null)                                    , gi.current_state_id = ws.state_id                                    , ws.state_descriptor not in                                        ('workflow end', 'and state')),                                 0,                                 'completed',                                 'running'))),            t_gps_applications.visible_flag       stategps.t_gps_applications   t_gps_applications,            stategps.t_gps_app_properties t_gps_app_properties      t_gps_applications.application_id =            t_gps_app_properties.application_id        , (t_gps_app_properties.property_value = 'true' ,             t_gps_app_properties.property_name = 'projectplan_application')        , not exists (select u.*               tas.t_users u, t_gps_app_properties ap              to_char(u.user_id) = ap.property_value                , ap.property_name = 'project_manager'                , ap.application_id = t_gps_applications.application_id)

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