sql select statement to show results if source = B exists then results with source B otherwise results from source O -

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i want select report report source 'b' if exists, otherwise report_source 'o' 

select r.rep_id,        r.rep_name,        r.rep_status,        r.rep_source        o.cmp_id,        o.cmp_company_name,        o.cmp_company_al   company o,        report r  o.cmp_id = r.rep_cmp_id    , r.rep_status in ('n','a')        , r.rep_source = ???decode;

output example:

rep_id rep_name rep_status rep_source cmp_id cmp_company_name cmp_company_name_al

100 rep-2000 o 144 asm assist support mgt

120 rep-9900 b 144 asm assist support mgt

i want results if rport source b. if there no report source company show report report source o

so results shown in case:

120 rep-9900 b 144 asm assist support mgt

i think you: (when want select char 'b' in rep_source when present else 'o'. go below code.)

select r.rep_id,        r.rep_name,        r.rep_status,         case when r.rep_source = 'b' 'b' else 'o' end rep_source         o.cmp_id,        o.cmp_company_name,        o.cmp_company_al   company o,        report r  o.cmp_id = r.rep_cmp_id    , r.rep_status in ('n','a')

else if want rep_source 'b' or 'o' values. go this:

     select r.rep_id,            r.rep_name,            r.rep_status,            r.rep_source,            o.cmp_id,            o.cmp_company_name,            o.cmp_company_al       company o,            report r      o.cmp_id = r.rep_cmp_id        , r.rep_status in ('n','a')        , r.rep_source ='b' or r.rep_source ='o'

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