Problems with Sub query

Hello, I'm looking to create a sub query to display certain information. On the form that the information is entered, the user has the option to enter a phone number extension, as appropriate. If this is the case, I want the phone number to show as 555-867-5309 (x 1234). However, without the problem of controls, the (x) will be displayed without worrying and seems sloppy. Here is the code I have, please notify.

There will be two places, it will be necessary - for the telephone number of the applicant and the app (SME) contact information manager.

Thank you.

select
    pm.pk_proj_master_id "Project Number",
    pm.trackit_work_order "TrackIt Work Order",
    pm.name "Project Name",
    pm.status "Project Status",
    req.last_name||', '||req.first_name||', '||req.middle_initial||'.' "Requestor Name",
    rde.department_group_descr "Requestor Department Name",
    req.department_descr "Requestor Division Name",
    
    pm.requester_ext,
    case
        when pm.requester_ext in 
            (
            select 
                pm.requester_phone|| '(x'||pm.requester_ext ||')' "Requesters Number"
            from 
                protrac_master pm
            where
                pm.requester_ext is not null
            )
        
        else
            (
            select
                pm.requester_phone "Requesters Number"
            from 
                protrac_master pm
            )   
    end as "Requester Number",
     
    man.last_name||', '||man.first_name||', '||man.middle_initial||'.' "SME Name",
    mdg.department_group_descr "SME Department Name",
    man.department_descr "SME Division Name",
    
    pm.app_manager_ext,
    case
        when pm.app_manager_ext in 
            (
            select 
                pm.app_manager_phone|| '(x'||pm.app_manager_ext ||')' "SME Number"
            from 
                protrac_master pm
            where
                pm.app_manager_phone is not null
            )
        
        else
            (
            select
                pm.app_manager_phone "SME Number"
            from 
                protrac_master pm
            )   
    end as "Requester Number",

    pm.createby_date "Date Entered",
    pm.date_begin "Date Began",
    pm.date_completed "Date Completed",
    pm.estimated_date "Estimated Completion Date"

from
    protrac_master pm,
    cobr.vw_pps_payroll req, cobr.department_group rde,
    cobr.vw_pps_payroll man, cobr.department_group mdg
    
where
    pm.requester_id         = req.emple_no and
    pm.requester_dept_id    = rde.pk_department_group_id and
    pm.app_manager_id       = man.emple_no and 
    pm.app_manager_dept_id  = mdg.pk_department_group_id
    
order by 
    pm.pk_proj_master_id

I think you can avoid the sub query thing simply by using the NVL2 function:

select ...
     , NVL2( pm.requester_ext
           , pm.requester_phone|| '(x'||pm.requester_ext ||')'
           , pm.requester_phone) "Requesters Number"
       ...
     , NVL2( pm.app_manager_ext
           , pm.app_manager_phone|| '(x'||pm.app_manager_ext ||')'
           , pm.app_manager_phone) "Manager Number"
       ...
  from protrac_master pm
     , ...

Tags: Database

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