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Agregação de dados


Esta é a resposta para sua pergunta:
SELECT
   program_id, 
   reporting_day, 
   CAST((CAST(total AS FLOAT)/CAST(total_seconds AS FLOAT)*100*weight) AS DECIMAL(5,2))
     AS viewing_percentage
   FROM table_b
        OUTER APPLY (
             SELECT
                  SUM(seconds_viewed) AS total
                  FROM table_a
                  WHERE table_a.program_id = table_b.program_id
                  AND table_a.viewing_day <= table_b.reporting_day
         ) AS t

O ambiente que usei é o Microsoft SQL Server 2014