In some cases as per the requirements you will need to add 'ALL' as an independent parameter value (not a multivalue parameter)
1) Create a new dataset to populate parameter values
Ex: select distinct city from table1 where city is not null
union
select 'ALL' as city from dual
order by 1
2) Modify your main dataset query
Ex: where (city = :city or 'ALL' = :city)
Thank you
1) Create a new dataset to populate parameter values
Ex: select distinct city from table1 where city is not null
union
select 'ALL' as city from dual
order by 1
2) Modify your main dataset query
Ex: where (city = :city or 'ALL' = :city)
Thank you
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