sql - CASE with Join | Query Optimization -

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i need optmizing query,

it's running on preview mode when import report, report gets failing

select su4.user_value codice_skoff,       case when (su1r.user_id = 'a' , su4.user_value = '9') 'testa'            when (su1r.user_id = 'b' , su4.user_value = '10') 'testb'            when (su1r.user_id = 'c' , su4.user_value = '11') 'testc'            when (su1r.user_id = 'd' , su4.user_value = '12') 'testd'             else 'none'       end

i think it's because of case, turns report slow , gets failing message

after from have several left outer join

thanks in advance


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