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A consulta não retorna os resultados conforme o esperado


Isso deve garantir que ele tenha tanto 
WHERE   id IN 
        ( 
        SELECT  clientid 
        FROM    campaigns 
        WHERE   status IN ('L') 
        ) 
    AND id  IN 
        ( 
        SELECT  clientid 
        FROM    campaigns 
        WHERE   status IN ('P') 
        )

Ou tente Subconsultas com EXISTS 
WHERE   EXISTS
        (
        SELECT  clientid 
        FROM    campaigns 
        WHERE   status IN ('L') 
        AND     clientid = client.id
        )    
    AND EXISTS
        (
        SELECT  clientid 
        FROM    campaigns 
        WHERE   status IN ('P') 
        AND     clientid = client.id
        )