how to set a null value to default in oracle sql -

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how set empty set or null value default value 1?

so far, have statement, in case null values want handle that:

select case when count(*)=0                     0                   else 1                     end output  testtbl  timestamp = to_char(sysdate-1, 'yyyymmdd')||'0000'; 

select case when exists                    ( select *                       testtbl                       timestamp = to_char(sysdate-1, 'yyyymmdd') || '0000'                    )             1             else 0        end output dual

edit

added from dual oracle not allow select without from clause.


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